165-436: 16, see text Euarctos americanus The American black bear ( Ursus americanus ), also known as the black bear , is a species of medium-sized bear endemic to North America . It is the continent's smallest and most widely distributed bear species. It is an omnivore , with a diet varying greatly depending on season and location. It typically lives in largely forested areas but will leave forests in search of food and
330-715: A golden eagle snatching a yearling cub. Once out of hibernation, mother bears may be able to fight off most potential predators. Even cougars will be displaced by an angry mother bear if they are discovered stalking the cubs. Flooding of dens after birth may also occasionally kill newborn cubs. However, in current times, bear fatalities are mainly attributable to human activities. Seasonally, thousands of black bears are hunted legally across North America to control their numbers, while some are illegally poached or trapped unregulated. Auto collisions also may claim many black bears annually. American black bears were once not considered true or "deep" hibernators , but because of discoveries about
495-423: A mutation–selection balance . It is predicted that a viral quasispecies at a low but evolutionarily neutral and highly connected (that is, flat) region in the fitness landscape will outcompete a quasispecies located at a higher but narrower fitness peak in which the surrounding mutants are unfit, "the quasispecies effect" or the "survival of the flattest". There is no suggestion that a viral quasispecies resembles
660-400: A "classical" method of determining species, such as with Linnaeus, early in evolutionary theory. However, different phenotypes are not necessarily different species (e.g. a four-winged Drosophila born to a two-winged mother is not a different species). Species named in this manner are called morphospecies . In the 1970s, Robert R. Sokal , Theodore J. Crovello and Peter Sneath proposed
825-424: A 'smallest clade' idea" (a phylogenetic species concept). Mishler and Wilkins and others concur with this approach, even though this would raise difficulties in biological nomenclature. Wilkins cited the ichthyologist Charles Tate Regan 's early 20th century remark that "a species is whatever a suitably qualified biologist chooses to call a species". Wilkins noted that the philosopher Philip Kitcher called this
990-763: A bear weighing 120 pounds (54 kg) was observed turning flat rocks weighing 310 to 325 pounds (141 to 147 kg) by flipping them over with a single foreleg. They move in a rhythmic, sure-footed way and can run at speeds of 25 to 30 miles per hour (40 to 48 km/h). American black bears have good eyesight and have been proven experimentally to be able to learn visual color discrimination tasks faster than chimpanzees and just as fast as domestic dogs . They are also capable of rapidly learning to distinguish different shapes such as small triangles, circles and squares. Adults typically range from 120 to 200 cm (47 to 79 in) in head-and-body length, and 70 to 105 cm (28 to 41 in) in shoulder height. Although they are
1155-428: A connected series of neighbouring populations, each of which can sexually interbreed with adjacent related populations, but for which there exist at least two "end" populations in the series, which are too distantly related to interbreed, though there is a potential gene flow between each "linked" population. Such non-breeding, though genetically connected, "end" populations may co-exist in the same region thus closing
1320-527: A curator at London Zoo was Evelyn Cheesman , in 1920. After the start of the Second World War , the London Zoo was closed multiple times for over a week, the first time being at 11:00 am on 3 September 1939, when all zoological places were closed by government order. Valuable animals were transferred to Whipsnade Zoo during the war for safety. On 27 September 1940, high explosive bombs damaged
1485-706: A darkened area called "Nightlife", which houses nocturnal animals such as Mohol bushbaby , slender lorises , West African pottos , Malagasy giant rats , aye-ayes and blind cave fish . The Mappin Terraces opened in 1913, and features an artificial rocky cliff made of concrete blocks for animal enrichment. This was the zoo's first major attempt at recreating natural environments without bars, influenced by European zoos such as Tierpark Hagenbeck, and many different species have been kept in this enclosure during its lifetime, including bears , penguins , sheep , goats , kangaroos , leopards, and wild boar . The Mappin Terraces
1650-432: A different species from its ancestors. Viruses have enormous populations, are doubtfully living since they consist of little more than a string of DNA or RNA in a protein coat, and mutate rapidly. All of these factors make conventional species concepts largely inapplicable. A viral quasispecies is a group of genotypes related by similar mutations, competing within a highly mutagenic environment, and hence governed by
1815-713: A female infant named Juno born to mother Mjukuu on 17 January 2024 and a second female infant named Venus was born to mother Effie on 8 February 2024, just three and a half weeks after the first. The Gorilla Kingdom area also features smaller enclosures housing white-naped mangabeys and Diana monkeys . The exhibit also features a walk-through aviary housing African birds . Into Africa is an Africa -themed area that opened in April 2006. Animals on display in this area include Chapman's zebras , common warthogs , okapis , common ostriches , giraffes , pygmy hippos , and African wild dogs . The Giraffe House at London Zoo, built in 1837,
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#17327933870691980-624: A forest canopy of hardwoods such as beech , maple , birch and coniferous species. Corn crops and oak-hickory mast are also common sources of food in some sections of the northeast; small, thick swampy areas provide excellent refuge cover largely in stands of white cedar . Along the Pacific coast, redwood , Sitka spruce and hemlocks predominate as overstory cover. Within these northern forest types are early successional areas important for American black bears, such as fields of brush, wet and dry meadows , high tidelands , riparian areas and
2145-508: A genetic boundary suitable for defining a species concept is present. DNA barcoding has been proposed as a way to distinguish species suitable even for non-specialists to use. One of the barcodes is a region of mitochondrial DNA within the gene for cytochrome c oxidase . A database, Barcode of Life Data System , contains DNA barcode sequences from over 190,000 species. However, scientists such as Rob DeSalle have expressed concern that classical taxonomy and DNA barcoding, which they consider
2310-523: A large coral reef aquarium with corals and over 200 reef fish. The Millennium Conservation Centre aims to be environmentally friendly, constructed from materials requiring little energy to produce, and generating its heating from the body heat of both the animals and visitors. In May 2015, an exhibit called "In With the Spiders" opened in the exhibit as Europe's first and only spider walkthrough exhibit. It houses many different types of spiders, including one of
2475-435: A large fire broke out at Animal Adventure. The fire was brought under control by 9:30 am after spreading to the cafe and shop on the premises. It is estimated that three-quarters of the cafe/shop suffered severe damage. A nine-year-old aardvark named Misha was pronounced dead, and four meerkats were declared unaccounted for and presumed dead. The zoo reopened on Christmas Eve. One of London Zoo's most well-known buildings,
2640-465: A lineage should be divided into multiple chronospecies , or when populations have diverged to have enough distinct character states to be described as cladistic species. Species and higher taxa were seen from the time of Aristotle until the 18th century as categories that could be arranged in a hierarchy, the great chain of being . In the 19th century, biologists grasped that species could evolve given sufficient time. Charles Darwin 's 1859 book On
2805-486: A male named Asim, a female named Gaysha, and their two cubs, Zac and Crispin, born in June 2022. The enclosure is 2,500 square metres (27,000 square feet) in size and features authentic Indonesian plant life, as well as a net canopy of 3mm steel cable supported by four metal poles. The Casson Pavilion is one of the zoo's Grade II listed buildings and was designed by architect Sir Hugh Casson between 1962 and 1965. The building
2970-492: A misnomer, need to be reconciled, as they delimit species differently. Genetic introgression mediated by endosymbionts and other vectors can further make barcodes ineffective in the identification of species. A phylogenetic or cladistic species is "the smallest aggregation of populations (sexual) or lineages (asexual) diagnosable by a unique combination of character states in comparable individuals (semaphoronts)". The empirical basis – observed character states – provides
3135-401: A motor-like humming sound when comfortable or nursing. American black bears often mark trees using their teeth and claws as a form of communication with other bears, a behavior common to many species of bears. Sows usually produce their first litter at the age of 3 to 5 years, with those living in more developed areas tending to get pregnant at younger ages. The breeding period usually occurs in
3300-449: A particular species, including which genus (and higher taxa) it is placed in, is a hypothesis about the evolutionary relationships and distinguishability of that group of organisms. As further information comes to hand, the hypothesis may be corroborated or refuted. Sometimes, especially in the past when communication was more difficult, taxonomists working in isolation have given two distinct names to individual organisms later identified as
3465-400: A perfect model of life, it is still a useful tool to scientists and conservationists for studying life on Earth, regardless of the theoretical difficulties. If species were fixed and clearly distinct from one another, there would be no problem, but evolutionary processes cause species to change. This obliges taxonomists to decide, for example, when enough change has occurred to declare that
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#17327933870693630-1270: A reduced heart rate and basal metabolic rate. The metabolic rate of a hibernating bear will remain at a reduced level for up to 21 days after hibernation. After emerging from their winter dens in spring, they wander their home ranges for two weeks so that their metabolism accustoms itself to the activity. In mountainous areas, they seek southerly slopes at lower elevations for forage and move to northerly and easterly slopes at higher elevations as summer progresses. The time that American black bears emerge from hibernation varies. Factors affecting this include temperature, flooding, and hunger. In southern areas, they may wake up in midwinter. Further north, they may not be seen until late March, April, or even early May. Altitude also has an effect. Bears at lower altitudes tend to emerge earlier. Mature males tend to come out earliest, followed by immature males and females, and lastly mothers with cubs. Mothers with yearling cubs are seen before those with newborns. Generally, American black bears are largely crepuscular in foraging activity, though they may actively feed at any time. Up to 85% of their diet consists of vegetation, though they tend to dig less than brown bears, eating far fewer roots , bulbs , corms and tubers than
3795-417: A reptile house. The pavilion houses roughly 50 different species of exotic rainforest birds, including blue-crowned laughingthrushes , collared trogons , Socorro doves , red-crested turacos , splendid sunbirds and red-and-yellow barbets . Outside the entrance is one of the pavilion's prominent features, a large elaborate clock by Tim Hunkin . It gives a bird-themed display every thirty minutes throughout
3960-400: A short way of saying that something applies to many species within a genus, but not to all. If scientists mean that something applies to all species within a genus, they use the genus name without the specific name or epithet. The names of genera and species are usually printed in italics . However, abbreviations such as "sp." should not be italicised. When a species' identity is not clear,
4125-404: A specialist may use "cf." before the epithet to indicate that confirmation is required. The abbreviations "nr." (near) or "aff." (affine) may be used when the identity is unclear but when the species appears to be similar to the species mentioned after. With the rise of online databases, codes have been devised to provide identifiers for species that are already defined, including: The naming of
4290-523: A species as groups of actually or potentially interbreeding natural populations, which are reproductively isolated from other such groups. It has been argued that this definition is a natural consequence of the effect of sexual reproduction on the dynamics of natural selection. Mayr's use of the adjective "potentially" has been a point of debate; some interpretations exclude unusual or artificial matings that occur only in captivity, or that involve animals capable of mating but that do not normally do so in
4455-400: A species as determined by a taxonomist. A typological species is a group of organisms in which individuals conform to certain fixed properties (a type), so that even pre-literate people often recognise the same taxon as do modern taxonomists. The clusters of variations or phenotypes within specimens (such as longer or shorter tails) would differentiate the species. This method was used as
4620-491: A species. All species definitions assume that an organism acquires its genes from one or two parents very like the "daughter" organism, but that is not what happens in HGT. There is strong evidence of HGT between very dissimilar groups of prokaryotes , and at least occasionally between dissimilar groups of eukaryotes , including some crustaceans and echinoderms . The evolutionary biologist James Mallet concludes that there
4785-685: A species. Generally the term includes the unknown element of a distinct act of creation. Many authors have argued that a simple textbook definition, following Mayr's concept, works well for most multi-celled organisms , but breaks down in several situations: Species identification is made difficult by discordance between molecular and morphological investigations; these can be categorised as two types: (i) one morphology, multiple lineages (e.g. morphological convergence , cryptic species ) and (ii) one lineage, multiple morphologies (e.g. phenotypic plasticity , multiple life-cycle stages). In addition, horizontal gene transfer (HGT) makes it difficult to define
4950-503: A study of American black bears in Nevada found that the amount of annual mortality of a population of bears in wilderness areas was 0%, whereas in developed areas in the state this figure rose to 83%. Survival in subadults is generally less assured. In Alaska, only 14–17% of subadult males and 30–48% of subadult females were found in a study to survive to adulthood. Across the range, the estimated number of cubs who survive past their first year
5115-528: A taxonomic decision at the discretion of cognizant specialists, is not governed by the Codes of Zoological or Botanical Nomenclature, in contrast to the PhyloCode , and contrary to what is done in several other fields, in which the definitions of technical terms, like geochronological units and geopolitical entities, are explicitly delimited. The nomenclatural codes that guide the naming of species, including
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5280-517: A traditional biological species. The International Committee on Taxonomy of Viruses has since 1962 developed a universal taxonomic scheme for viruses; this has stabilised viral taxonomy. Most modern textbooks make use of Ernst Mayr 's 1942 definition, known as the Biological Species Concept as a basis for further discussion on the definition of species. It is also called a reproductive or isolation concept. This defines
5445-447: A variation on the morphological species concept, a phenetic species, defined as a set of organisms with a similar phenotype to each other, but a different phenotype from other sets of organisms. It differs from the morphological species concept in including a numerical measure of distance or similarity to cluster entities based on multivariate comparisons of a reasonably large number of phenotypic traits. A mate-recognition species
5610-826: A variety of mast-producing hardwood species. The spruce-fir forest dominates much of the range of the American black bear in the Rockies . Important non-forested areas here are wet meadows, riparian areas, avalanche chutes, roadsides, burns, sidehill parks and subalpine ridgetops . In areas where human development is relatively low, such as stretches of Canada and Alaska, American black bears tend to be found more regularly in lowland regions. In parts of northeastern Canada, especially Labrador , American black bears have adapted exclusively to semi-open areas that are more typical habitat in North America for brown bears (likely due to
5775-515: A variety of reasons. Viruses are a special case, driven by a balance of mutation and selection , and can be treated as quasispecies . Biologists and taxonomists have made many attempts to define species, beginning from morphology and moving towards genetics . Early taxonomists such as Linnaeus had no option but to describe what they saw: this was later formalised as the typological or morphological species concept. Ernst Mayr emphasised reproductive isolation, but this, like other species concepts,
5940-438: Is "an entity composed of organisms which maintains its identity from other such entities through time and over space, and which has its own independent evolutionary fate and historical tendencies". This differs from the biological species concept in embodying persistence over time. Wiley and Mayden stated that they see the evolutionary species concept as "identical" to Willi Hennig 's species-as-lineages concept, and asserted that
6105-416: Is 60%. With the exception of the rare confrontation with an adult brown bear or a gray wolf pack, adult black bears are not usually subject to natural predation. However, as evidenced by scats with fur inside of them and the recently discovered carcass of an adult sow with puncture marks in the skull, black bears may occasionally fall prey to jaguars in the southern parts of their range. In such scenarios,
6270-400: Is a group of sexually reproducing organisms that recognise one another as potential mates. Expanding on this to allow for post-mating isolation, a cohesion species is the most inclusive population of individuals having the potential for phenotypic cohesion through intrinsic cohesion mechanisms; no matter whether populations can hybridise successfully, they are still distinct cohesion species if
6435-452: Is a population of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring , typically by sexual reproduction . It is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity . Other ways of defining species include their karyotype , DNA sequence, morphology , behaviour, or ecological niche . In addition, paleontologists use
6600-458: Is a set of organisms adapted to a particular set of resources, called a niche, in the environment. According to this concept, populations form the discrete phenetic clusters that we recognise as species because the ecological and evolutionary processes controlling how resources are divided up tend to produce those clusters. A genetic species as defined by Robert Baker and Robert Bradley is a set of genetically isolated interbreeding populations. This
6765-477: Is a walk-through exhibit housing various species of birds including waldrapp ibises , Abdim's storks , great arguses , emerald doves , and scarlet ibises . The Blackburn Pavilion is a rainforest-themed tropical bird aviary that opened in March 2008 as a refurbishment of the zoo's outdated birdhouse. It rejuvenated the birdhouse by adding a walk-through element. The building was originally constructed in 1883 as
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6930-414: Is called speciation . Charles Darwin was the first to describe the role of natural selection in speciation in his 1859 book The Origin of Species . Speciation depends on a measure of reproductive isolation , a reduced gene flow. This occurs most easily in allopatric speciation, where populations are separated geographically and can diverge gradually as mutations accumulate. Reproductive isolation
7095-412: Is called the specific name or the specific epithet (in botanical nomenclature , also sometimes in zoological nomenclature ). For example, Boa constrictor is one of the species of the genus Boa , with constrictor being the species' epithet. While the definitions given above may seem adequate at first glance, when looked at more closely they represent problematic species concepts. For example,
7260-410: Is currently an Australia-themed exhibit called "The Outback", housing emus and red-necked wallabies . There was an aquarium at the zoo from 1853 until 2019. The zoo's first aquarium was also the world's first public aquarium, and was created and stocked by Philip Henry Gosse who coined the word "aquarium", as a portmanteau of aquatic vivarium. In 1853 opened a building known as Fish House, while
7425-561: Is currently undeveloped. London Zoo established a Community Access Scheme in 2019 to provide 100,000 subsidised tickets to charities and groups assisting low-income families, older individuals, and people with disabilities. The scheme is intended to run until 2023. This started with a grant from the National Lottery Heritage Fund to convert the Snowdon Aviary to a colobus monkey enclosure. The scheme
7590-403: Is described formally, in a publication that assigns it a unique scientific name. The description typically provides means for identifying the new species, which may not be based solely on morphology (see cryptic species ), differentiating it from other previously described and related or confusable species and provides a validly published name (in botany) or an available name (in zoology) when
7755-671: Is further weakened by the existence of microspecies , groups of organisms, including many plants, with very little genetic variability, usually forming species aggregates . For example, the dandelion Taraxacum officinale and the blackberry Rubus fruticosus are aggregates with many microspecies—perhaps 400 in the case of the blackberry and over 200 in the dandelion, complicated by hybridisation , apomixis and polyploidy , making gene flow between populations difficult to determine, and their taxonomy debatable. Species complexes occur in insects such as Heliconius butterflies, vertebrates such as Hypsiboas treefrogs, and fungi such as
7920-726: Is hard or even impossible to test. Later biologists have tried to refine Mayr's definition with the recognition and cohesion concepts, among others. Many of the concepts are quite similar or overlap, so they are not easy to count: the biologist R. L. Mayden recorded about 24 concepts, and the philosopher of science John Wilkins counted 26. Wilkins further grouped the species concepts into seven basic kinds of concepts: (1) agamospecies for asexual organisms (2) biospecies for reproductively isolated sexual organisms (3) ecospecies based on ecological niches (4) evolutionary species based on lineage (5) genetic species based on gene pool (6) morphospecies based on form or phenotype and (7) taxonomic species,
8085-427: Is home to Asian small-clawed otters , while the other enclosure houses meerkats . The exhibit was initially designed to accommodate meerkats , otters , European forest reindeer and Goeldi's monkeys . However, the reindeer were relocated to Whipsnade Zoo , and the monkeys were transferred to the zoo's Rainforest Life building. Three Island Pond was only granted exhibit status in 2021. This artificially shaped pond
8250-440: Is named after the three islands within it. It is separated into two enclosures: one houses greater flamingoes , and the other is home to Eastern white pelicans . Other notable animals in London Zoo's collection include Bactrian camels , military macaws , hyacinth macaws , blue-throated macaws and Alaotran gentle lemurs . The zoo's north bank, north of the canal, formerly housed the bird incubation and rearing unit. The area
8415-403: Is no easy way to tell whether related geographic or temporal forms belong to the same or different species. Species gaps can be verified only locally and at a point of time. One is forced to admit that Darwin's insight is correct: any local reality or integrity of species is greatly reduced over large geographic ranges and time periods. The botanist Brent Mishler argued that the species concept
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#17327933870698580-478: Is not valid, notably because gene flux decreases gradually rather than in discrete steps, which hampers objective delimitation of species. Indeed, complex and unstable patterns of gene flux have been observed in cichlid teleosts of the East African Great Lakes . Wilkins argued that "if we were being true to evolution and the consequent phylogenetic approach to taxa, we should replace it with
8745-586: Is similar to Mayr's Biological Species Concept, but stresses genetic rather than reproductive isolation. In the 21st century, a genetic species could be established by comparing DNA sequences. Earlier, other methods were available, such as comparing karyotypes (sets of chromosomes ) and allozymes ( enzyme variants). An evolutionarily significant unit (ESU) or "wildlife species" is a population of organisms considered distinct for purposes of conservation. In palaeontology , with only comparative anatomy (morphology) and histology from fossils as evidence,
8910-513: Is sometimes an important source of genetic variation. Viruses can transfer genes between species. Bacteria can exchange plasmids with bacteria of other species, including some apparently distantly related ones in different phylogenetic domains , making analysis of their relationships difficult, and weakening the concept of a bacterial species. London Zoological Gardens London Zoo , previously known as ZSL London Zoo or London Zoological Gardens and sometimes called Regent's Park Zoo ,
9075-439: Is sometimes attracted to human communities due to the immediate availability of food. The International Union for Conservation of Nature (IUCN) lists the American black bear as a least-concern species because of its widespread distribution and a large population, estimated to be twice that of all other bear species combined. Along with the brown bear ( Ursus arctos ), it is one of only two modern bear species not considered by
9240-507: Is stated that the bears had been seen in the zoological gardens to couple freely, but previously to 1848 most had rarely conceived. In the reports published since this date three species have produced young (hybrids in one case), ... A bear shot in autumn 1986 in Michigan was thought by some to be an American black bear/grizzly bear hybrid, because of its unusually large size and its proportionately larger brain case and skull. DNA testing
9405-523: Is the world's oldest scientific zoo . It was opened in London on 27 April 1828, and was originally intended to be used as a collection for scientific study . In 1831 or 1832, the animals of the Tower of London menagerie were transferred to the zoo's collection. It was opened to the public in 1847. As of December 2022, it houses a collection of 14,926 individuals, making it one of the largest collections in
9570-643: Is the world's oldest zoo building still used for its original purpose. The Giraffe House has been designated as a Grade II listed building because of its historical and architectural significance. Rainforest Life is a walk-through indoor exhibit that houses many species of South American rainforest animals. Among the species in the main forest walk-through are Linnaeus's two-toed sloths , golden lion tamarins , red titi monkeys , red-faced spider monkeys , big hairy armadillos , Goeldi's marmosets , southern tamandua , golden-headed lion tamarins , red-footed tortoises and Rodrigues flying foxes . The building also has
9735-594: Is threatened by hybridisation, but this can be selected against once a pair of populations have incompatible alleles of the same gene, as described in the Bateson–Dobzhansky–Muller model . A different mechanism, phyletic speciation, involves one lineage gradually changing over time into a new and distinct form (a chronospecies ), without increasing the number of resultant species. Horizontal gene transfer between organisms of different species, either through hybridisation , antigenic shift , or reassortment ,
9900-605: The Driftless Area of southeastern Minnesota , northeastern Iowa , and southwestern Wisconsin are common. In 2019, biologists with the Iowa Department of Natural Resources confirmed documentation of an American black bear living year-round in woodlands near the town of Decorah in northeastern Iowa, believed to be the first instance of a resident black bear in Iowa since the 1880s. Surveys taken from 35 states in
10065-530: The ICZN for animals and the ICN for plants, do not make rules for defining the boundaries of the species. Research can change the boundaries, also known as circumscription, based on new evidence. Species may then need to be distinguished by the boundary definitions used, and in such cases the names may be qualified with sensu stricto ("in the narrow sense") to denote usage in the exact meaning given by an author such as
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#173279338706910230-628: The Southeastern United States . American black bears in the southern Appalachian Mountains survive in predominantly oak-hickory and mixed mesophytic forests. In the coastal areas of the southeast (such as Florida , the Carolinas and Louisiana ), bears inhabit a mixture of flatwoods , bays and swampy hardwood sites. In the northeastern part of the range (the United States and Canada), prime habitat consists of
10395-1071: The West Coast , although they typically follow Bergmann's rule , and bears from the northwest are often slightly heavier than the bears from the southeast. Adult males typically weigh between 57–250 kg (126–551 lb), while females weigh 33% less at 41–170 kg (90–375 lb). In California, studies indicate that the average mass is 86 kg (190 lb) in adult males and 58 kg (128 lb) in adult females. Adults in Yukon Flats National Wildlife Refuge in east-central Alaska were found to average 87.3 kg (192 lb) in males and 63.4 kg (140 lb) in females, whereas on Kuiu Island in southeastern Alaska (where nutritious salmon are readily available) adults averaged 115 kg (254 lb). In Great Smoky Mountains National Park , adult males averaged 112 kg (247 lb) and adult females averaged 47 kg (104 lb) per one study. In one of
10560-399: The fly agaric . Natural hybridisation presents a challenge to the concept of a reproductively isolated species, as fertile hybrids permit gene flow between two populations. For example, the carrion crow Corvus corone and the hooded crow Corvus cornix appear and are classified as separate species, yet they can hybridise where their geographical ranges overlap. A ring species is
10725-507: The jaguar ( Panthera onca ) of Latin America or the leopard ( Panthera pardus ) of Africa and Asia. In contrast, the scientific names of species are chosen to be unique and universal (except for some inter-code homonyms ); they are in two parts used together : the genus as in Puma , and the specific epithet as in concolor . A species is given a taxonomic name when a type specimen
10890-620: The sun bear is also a relatively recent split from this lineage. A small primitive bear called Ursus abstrusus is the oldest known North American fossil member of the genus Ursus , dated to 4.95 mya. This suggests that U. abstrusus may be the direct ancestor of the American black bear, which evolved in North America. Although Wolverton and Lyman still consider U. vitabilis an "apparent precursor to modern black bears", it has also been placed within U. americanus . The ancestors of American black bears and Asian black bears diverged from sun bears 4.58 mya. The American black bear then split from
11055-991: The thylacine , the Falkland Islands Wolf , a pair of pink headed ducks , some Passenger pigeons , the Bubal hartebeest , the Syrian wild ass , the Northern Sumatran rhinoceros , the Javan tiger , the Schomburgk's deer , the Pinta Island tortoise , the Caspian tiger , as well as the endlings of the norfolk kaka , the Partula turgida snail, and the Santa Lucian Pilorie . Obaysch
11220-406: The "cynical species concept", and arguing that far from being cynical, it usefully leads to an empirical taxonomy for any given group, based on taxonomists' experience. Other biologists have gone further and argued that we should abandon species entirely, and refer to the "Least Inclusive Taxonomic Units" (LITUs), a view that would be coherent with current evolutionary theory. The species concept
11385-503: The 1990s, the zoo possessed 7,000 animals of 850 species; the next biggest collection in Britain was Chester Zoo , with just under 3,500 animals. Many of the species in London Zoo could not be seen anywhere else in the country, such as the wombat , Tasmanian devil or long-nosed potoroo . Although this vast collection was part of the zoo's appeal, it may also have been one of the main causes of its financial problems. This contributed to
11550-532: The American black bears remained arboreal omnivores, like their Asian ancestors. The American black bear's generalist behavior allowed it to exploit a wider variety of foods and has been given as a reason why, of these three genera, it alone survived climate and vegetative changes through the last Ice Age while the other, more specialized North American predators became extinct. However, both Arctodus and Tremarctos had survived several other, previous ice ages . After these prehistoric ursids became extinct during
11715-603: The Asian black bear 4.08 mya. The earliest American black bear fossils, which were located in Port Kennedy, Pennsylvania , greatly resemble the Asian species, though later specimens grew to sizes comparable to grizzly bears . From the Holocene to the present, American black bears seem to have shrunk in size, but this has been disputed because of problems with dating these fossil specimens. The American black bear lived during
11880-610: The Duke of Edinburgh in March 2007, Gorilla Kingdom consists of a moated island, home to a group of western lowland gorillas . The zoo currently holds seven gorillas: an adult male named Kiburi, two adult females named Mjukuu and Effie, a juvenile female named Alika (the daughter of Mjukuu and former silverback Kumbuka) born in December 2014, a juvenile male named Gernot (the son of Effie and former silverback Kumbuka) born in November 2015,
12045-518: The Galápagos was opened in 2009 to coincide with the 200th birthday of Charles Darwin , and is home to three female Galápagos giant tortoises named Dolly, Polly and Priscilla. It includes a large indoor area with a heated pond and underfloor heating , while the outdoor paddock has been designed to mimic the tortoise's natural environment and features two heated pools, one of which is a naturalistic clay wallow. London Zoo's Komodo dragon enclosure
12210-574: The IUCN to be globally threatened with extinction. The American black bear is not closely related to the brown bear or polar bear , though all three species are found in North America ; genetic studies reveal that they split from a common ancestor 5.05 million years ago (mya). American and Asian black bears are considered sister taxa and are more closely related to each other than to the other modern species of bears. According to recent studies,
12375-517: The June–July period, though it can extend to August in the species' northern range. The breeding period lasts for two to three months. Both sexes are promiscuous. Males try to mate with several females, but large, dominant ones may violently claim a female if another mature male comes near. Copulation can last 20–30 minutes. Sows tend to be short-tempered with their mates after copulating. The fertilized eggs undergo delayed development and do not implant in
12540-550: The Lemurs is a walk-through exhibit housing a group of ring-tailed lemurs and Lac Alaotra bamboo lemurs . It also has a family of aye-ayes living in the indoor section as well as lesser hedgehog tenrecs . The exhibit is designed to resemble a shrub forest in Madagascar , featuring plant life such as loquat and Chusan palm trees. Opened by comedians Noel Fielding and Julian Barratt of The Mighty Boosh in 2005, Meet
12705-478: The Lions, Tiger Territory, and Attenborough Komodo Dragon House. The Snowdon Aviary was designed by Cedric Price , Frank Newby and Antony Armstrong-Jones, 1st Earl of Snowdon , built between 1962 and 1964, and opened in 1965. It was Britain's first public, walk-through aviary, and primarily housed shorebirds such as gulls and ibis. It is constructed with a pyramidal aluminium framework reaching 21m high. In 2021,
12870-530: The Monkeys is a walk-through enclosure that houses a troop of black-capped squirrel monkeys . The exhibit has no roof, and there are no boundaries between the monkeys and the visitors. It is the southernmost enclosure in the zoo. Opened in May 2006, Butterfly Paradise houses several species of butterfly and moth from around the world, as well as plant species specially selected to provide nectar and breeding areas for
13035-626: The Origin of Species explained how species could arise by natural selection . That understanding was greatly extended in the 20th century through genetics and population ecology . Genetic variability arises from mutations and recombination , while organisms themselves are mobile, leading to geographical isolation and genetic drift with varying selection pressures . Genes can sometimes be exchanged between species by horizontal gene transfer ; new species can arise rapidly through hybridisation and polyploidy ; and species may become extinct for
13200-563: The Queen begging her to stop the sale. He was sold to Phineas Barnum 's circus, the Barnum & Bailey Circus , in 1882, where he was later crushed by a locomotive and killed. Winnipeg the Bear (or Winnie) was an American black bear given to the zoo in 1914 by a Canadian lieutenant , Harry Colebourn . A. A. Milne visited with his son Christopher Robin , and the boy was so enamoured with
13365-807: The Reptile House opened in 1927 and was designed by Joan Beauchamp Procter and Sir Edward Guy Dawber . It housed several species of reptile, including Jamaican boa , Philippine crocodiles , Annam leaf turtles , Fiji banded iguanas , northern caiman lizards , puff adders , king cobras and emerald tree boas . In December 2012, a refurbished amphibian section was opened to the public, displaying amphibians such as Chinese giant salamanders , axolotls , African bullfrogs , Lake Oku clawed frogs , White's tree frogs and various types of poison dart frog . A new Reptile House, titled "The Secret Life of Reptiles and Amphibians", opened in Easter 2024. Giants of
13530-723: The Rodent house, the Civet house, the gardener's office, the propagating sheds, the North Gate and the Zebra house. In January 1941, the Camel House was also hit, and the aquarium could not open until May 1943 due to extensive bombing. No animals were harmed during the incidents, although a zebra, a female ass, and her foal escaped from the zoo during the bombings. For safety reasons, all venomous animals were killed at London Zoo. Throughout
13695-532: The United Kingdom's most endangered animals, the fen raft spider , as well as golden orb weavers . Penguin Beach opened on 26 May 2011 and houses Humboldt penguins . A single male northern rockhopper penguin named Ricky also lived there until he was moved to Whipsnade Zoo in March 2017. The pool itself is the largest penguin pool containing penguins in an English zoo. Opened in March 2015, In with
13860-698: The United Kingdom. It is managed under the aegis of the Zoological Society of London (established in 1826), and is situated at the northern edge of Regent's Park , on the boundary line between the City of Westminster and the borough of Camden (the Regent's Canal runs through it). The Society also has a more spacious site at Whipsnade Zoo in Bedfordshire to which the larger animals such as elephants and rhinos have been moved. As well as being
14025-405: The abbreviation "sp." in the singular or "spp." (standing for species pluralis , Latin for "multiple species") in the plural in place of the specific name or epithet (e.g. Canis sp.). This commonly occurs when authors are confident that some individuals belong to a particular genus but are not sure to which exact species they belong, as is common in paleontology . Authors may also use "spp." as
14190-589: The absence there of brown and polar bears, as well as other large carnivore species). The skulls of American black bears are broad, with narrow muzzles and large jaw hinges. In Virginia , the length of adult bear skulls was found to average 262 to 317 mm (10.3 to 12.5 in). Across its range, the greatest skull length for the species has been reportedly measured from 23.5 to 35 cm (9.3 to 13.8 in). Females tend to have slenderer and more pointed faces than males. Their claws are typically black or grayish-brown. The claws are short and rounded, being thick at
14355-570: The amount of hybridisation is insufficient to completely mix their respective gene pools . A further development of the recognition concept is provided by the biosemiotic concept of species. In microbiology , genes can move freely even between distantly related bacteria, possibly extending to the whole bacterial domain. As a rule of thumb, microbiologists have assumed that members of Bacteria or Archaea with 16S ribosomal RNA gene sequences more similar than 97% to each other need to be checked by DNA–DNA hybridisation to decide if they belong to
14520-551: The average of 65.2 kg (144 lb) in wild-land ones. In Waterton Lakes National Park , Alberta, adults averaged 125 to 128 kg (276 to 282 lb). The biggest wild American black bear ever recorded was a male from New Brunswick , shot in November 1972, that weighed 409 kg (902 lb) after it had been dressed, meaning it weighed an estimated 500 kg (1,100 lb) in life and measured 2.41 m (7 ft 11 in) long. Another notably outsized wild American black bear, weighing in at 408 kg (899 lb),
14685-467: The aviary was re-developed into a walkthrough primatarium called "Monkey Valley", which opened to the public in August 2022 and houses a troop of eastern black and white colobus monkeys . The structure has been a Grade II* listed building since 1998. Land of the Lions is London Zoo's Asiatic lion enclosure, opened in 2016. It covers 2,500 square metres, and is designed to resemble an Indian town on
14850-434: The base and tapering to a point. Claws from both hind and front legs are almost identical in length, though the foreclaws tend to be more sharply curved. The paws of the species are relatively large, with a rear foot length of 13.7 to 22.5 cm (5.4 to 8.9 in), which is proportionately larger than other medium-sized bear species, but much smaller than the paws of large adult brown, and especially polar bears. The soles of
15015-612: The bear evolved alongside larger, more aggressive bear species, such as the extinct giant short-faced bear and the grizzly bear, that monopolized more open habitats and the historic presence of larger predators, such as Smilodon and the American lion , that could have preyed on black bears. Although found in the largest numbers in wild, undisturbed areas and rural regions, American black bears can adapt to surviving in some numbers in peri-urban regions, as long as they contain easily accessible foods and some vegetative coverage. In most of
15180-409: The big cat would have the advantage if it ambushed the bear, killing it with a crushing bite to the back of the skull. Cubs tend to be more vulnerable to predation than adults, with known predators including bobcats , coyotes , cougars , gray wolves, brown bears and other bears of their own species. Many of these will stealthily snatch small cubs right from under the sleeping mother. There is record of
15345-474: The biological species concept, "the several versions" of the phylogenetic species concept, and the idea that species are of the same kind as higher taxa are not suitable for biodiversity studies (with the intention of estimating the number of species accurately). They further suggested that the concept works for both asexual and sexually-reproducing species. A version of the concept is Kevin de Queiroz 's "General Lineage Concept of Species". An ecological species
15510-505: The biological species concept, a cladistic species does not rely on reproductive isolation – its criteria are independent of processes that are integral in other concepts. Therefore, it applies to asexual lineages. However, it does not always provide clear cut and intuitively satisfying boundaries between taxa, and may require multiple sources of evidence, such as more than one polymorphic locus, to give plausible results. An evolutionary species, suggested by George Gaylord Simpson in 1951,
15675-428: The boundaries between closely related species become unclear with hybridisation , in a species complex of hundreds of similar microspecies , and in a ring species . Also, among organisms that reproduce only asexually , the concept of a reproductive species breaks down, and each clone is potentially a microspecies. Although none of these are entirely satisfactory definitions, and while the concept of species may not be
15840-459: The buildings and enclosures of the zoo, bringing many of the animals out into the open, where many thrived. This was an idea inspired by Hamburg Zoo , and led to newer designs for many of the buildings. Mitchell also envisaged a new 600-acre (240 ha) park to the north of London, and in 1926 Hall Farm, near to Whipsnade village , was bought. In 1931, Whipsnade Wild Animal Park, the world's first open zoological park, opened. The first woman to be
16005-753: The coastal islands and the adjacent mainland of southwestern British Columbia. Albino individuals have also been recorded. Black coats tend to predominate in humid areas such as Maine, New England, New York, Tennessee, Michigan and western Washington. Approximately 70% of all American black bears are black, though only 50% in the Rocky Mountains are black. Many in northwestern North America are cinnamon, blonde or light brown in color and thus may sometimes be mistaken for grizzly bears. Grizzly (and other types of brown) bears can be distinguished by their shoulder hump, larger size and broader, more concave skull. In his book The Great Bear Almanac , Gary Brown summarized
16170-413: The colon known as a fecal plug . Leptin is released into the bear's systems to suppress appetite. The retention of waste during hibernation (specifically in minerals such as calcium ) may play a role in the bear's resistance to atrophy. The body temperature does not drop significantly, like other mammalian hibernators (staying around 35 °C (95 °F)) and they remain somewhat alert and active. If
16335-433: The concept of a chronospecies can be applied. During anagenesis (evolution, not necessarily involving branching), some palaeontologists seek to identify a sequence of species, each one derived from the phyletically extinct one before through continuous, slow and more or less uniform change. In such a time sequence, some palaeontologists assess how much change is required for a morphologically distinct form to be considered
16500-416: The concept of the chronospecies since fossil reproduction cannot be examined. The most recent rigorous estimate for the total number of species of eukaryotes is between 8 and 8.7 million. About 14% of these had been described by 2011. All species (except viruses ) are given a two-part name , called a "binomial". The first part of a binomial is the genus to which the species belongs. The second part
16665-549: The contiguous United States, American black bears today are usually found in heavily vegetated mountainous areas, from 400 to 3,000 m (1,300 to 9,800 ft) in elevation. For American black bears living in the American Southwest and Mexico, habitat usually consists of stands of chaparral and pinyon juniper woods . In this region, bears occasionally move to more open areas to feed on prickly pear cactus . At least two distinct, prime habitat types are inhabited in
16830-512: The day. The Gibbon Habitat is a new enclosure for the zoo's two gibbons. It has two viewing points: one at ground level near the camel paddock and one at a higher level from Tiger Territory. One male pair is a northern white-cheeked gibbon , and the other is a hybrid species. They were initially housed in the Gorilla Kingdom. The Meerkats and Otters exhibit, previously known as "Happy Families", consists of two enclosures. One enclosure
16995-520: The distribution of populations outside those areas has not been updated since 1959. Mexico is the only country where the species is classified as "endangered". Throughout their range, habitats preferred by American black bears have a few shared characteristics. They are often found in areas with relatively inaccessible terrain, thick understory vegetation and large quantities of edible material (especially masts ). The adaptation to woodlands and thick vegetation in this species may have originally been because
17160-585: The dragon's natural habitat of a dry river bed, and sounds of Indonesian birds are regularly played into the enclosure. Tiny Giants, formerly called B.U.G.S., is an exhibit featuring invertebrates and fish. It is held in a building called The Millennium Conservation Centre, and the building displays over 160 species, including western honey bees , leafcutter ants , emperor scorpions , golden orb weavers , Madagascar orb weavers , Mexican redknee tarantulas , bird-eating spiders , desert locusts , moon jellyfish , partula snails and many others. It also features
17325-518: The early 1990s indicated that American black bear populations were either stable or increasing, except in Idaho and New Mexico . The population in the United States was estimated to range between 339,000 and 465,000 in 2011, though this estimate does not include data from Alaska, Idaho , South Dakota , Texas or Wyoming , whose populations were not recorded in the survey. In California there were an estimated 25,000-35,000 black bears in 2017, making it
17490-570: The edge of the Gir Forest National Park , intended to demonstrate how the lion's natural habitat overlaps with local urban environments. Hanuman langurs , small Indian mongooses , and Rüppell's vultures are also displayed in this area. Tiger Territory is London Zoo's Sumatran tiger enclosure, designed by architect Michael Kozdon and officially opened by the Duke of Edinburgh in March 2013. The zoo currently houses four tigers:
17655-666: The eight modern bear species are habitually arboreal (the most arboreal species, the American and Asian black bears and the sun bear, being fairly closely related). Their arboreal abilities tend to decline with age. They may be active at any time of the day or night, although they mainly forage by night. Bears living near human habitations tend to be more extensively nocturnal , while those living near brown bears tend to be more often diurnal . American black bears tend to be territorial and non- gregarious in nature. However, at abundant food sources (e.g. spawning salmon or garbage dumps), they may congregate and dominance hierarchies form, with
17820-435: The evidence to support hypotheses about evolutionarily divergent lineages that have maintained their hereditary integrity through time and space. Molecular markers may be used to determine diagnostic genetic differences in the nuclear or mitochondrial DNA of various species. For example, in a study done on fungi , studying the nucleotide characters using cladistic species produced the most accurate results in recognising
17985-440: The feet are black or brownish and are naked, leathery and deeply wrinkled. The hind legs are relatively longer than those of Asian black bears. The typically small tail is 7.7–17.7 cm (3.0–7.0 in) long. The ears are small and rounded and are set well back on the head. American black bears are highly dexterous , being capable of opening screw-top jars and manipulating door latches. They also have great physical strength;
18150-863: The female's womb until November. The gestation period lasts 235 days, and litters are usually born in late January to early February. Litter size is between one and six cubs, typically two or three. At birth, cubs weigh 280–450 g (0.62–0.99 lb) and measure 20.5 cm (8.1 in) in length. They are born with fine, gray, down-like hair and their hind quarters are underdeveloped. They typically open their eyes after 28–40 days and begin walking after 5 weeks. Cubs are dependent on their mother's milk for 30 weeks and will reach independence at 16–18 months. At 6 weeks, they attain 900 g (2.0 lb), by 8 weeks they reach 2.5 kg (5.5 lb) and by 6 months they weigh 18 to 27 kg (40 to 60 lb). They reach sexual maturity at 3 years and attain their full growth at 5 years. The average lifespan in
18315-459: The first scientific zoo, London Zoo also opened the first reptile house (1849), the first public aquarium (1853), first insect house (1881) and the first children's zoo (1938). ZSL receives no state funding and relies on 'Fellows' and 'Friends' memberships, entrance fees, venue hire, and sponsorship to generate income. The Zoological Society of London (ZSL) was established by Sir Stamford Raffles and Sir Humphry Davy in 1826, who obtained
18480-570: The hundreds each day by a single bear during the fall. During the fall period, bears may also habitually raid the nut caches of tree squirrels . Also extremely important in fall are berries such as huckleberries and buffalo berries . Bears living in areas near human settlements or around a considerable influx of recreational human activity often come to rely on foods inadvertently provided by humans, especially during summertime. These include refuse, birdseed, agricultural products and honey from apiaries . Species A species ( pl. : species)
18645-507: The insects. Species on display include the clipper butterfly , blue morpho butterfly , atlas moth , zebra longwing , glasswing butterfly and postman butterfly . The exhibit also features a caterpillar hatchery and a pupa display cabinet, where visitors can witness different types of pupae and the development of new butterflies. The Bird Safari opened in 2005 as a redevelopment of the old stork and ostrich house, replacing enclosures that were outdated by modern zoo-keeping standards. It
18810-494: The lack of a white blaze on the chest and hairier footpads. Despite their name, black bears show a great deal of color variation. Individual coat colors can range from white, blonde, cinnamon, light brown or dark chocolate brown to jet black, with many intermediate variations existing. Silvery-gray American black bears with a blue luster (this is found mostly on the flanks) occur along a portion of coastal Alaska and British Columbia. White to cream-colored American black bears occur in
18975-473: The land for the zoo and saw the plans before Raffles died of apoplexy (a stroke ) later that year on 5 July, his birthday. After his death, Henry Petty-Fitzmaurice, 3rd Marquess of Lansdowne took over the project and supervised the building of the first animal houses. The zoo opened in April 1828 to fellows of the Society, providing access to species such as Arabian oryx , greater kudus , orangutan and
19140-625: The largest population of the species in any of the 48 contiguous United States . In 2020 there were about 1,500 bears in Great Smoky Mountains National Park , where the population density is about two per square mile. In western North Carolina , the black bear population has dramatically increased in recent decades, from about 3,000 in the early 2000s to over 8,000 in the 2020s. As of 1993, known black bear populations in Mexico existed in four areas, though knowledge on
19305-526: The largest studies on regional body mass, bears in British Columbia averaged 73.7 kg (162 lb) in 89 females and 103.1 kg (227 lb) in 243 males. In Yellowstone National Park , a study found that adult males averaged 119 kg (262 lb) and adult females averaged 67 kg (148 lb). Black bears in north-central Minnesota averaged 70 kg (150 lb) in 163 females and 125 kg (276 lb) in 77 males. In New York,
19470-792: The largest, most powerful males dominating the most fruitful feeding spots. They mark their territories by rubbing their bodies against trees and clawing at the bark. Annual ranges held by mature male bears tend to be very large, though there is some variation. On Long Island off the coast of Washington, ranges average 5 sq mi (13 km), whereas on the Ungava Peninsula in Canada ranges can average up to 1,000 sq mi (2,600 km), with some male bears traveling as far as 4,349 sq mi (11,260 km) at times of food shortages. Bears may communicate with various vocal and non-vocal sounds. Tongue-clicking and grunting are
19635-832: The last decade. The current range in the United States is constant throughout most of the Northeast and within the Appalachian Mountains almost continuously from Maine to northern Georgia , the northern Midwest , the Rocky Mountain region , the West Coast and Alaska . However, it becomes increasingly fragmented or absent in other regions. Despite this, American black bears in those areas seem to have expanded their range in recent decades, such as with recent sightings in Ohio , Illinois , southern Indiana , and western Nebraska. Sightings of itinerant black bears in
19800-532: The last glacial period 10,000 years ago, American black bears were probably the only bear present in much of North America until the migration of brown bears to the rest of the continent. American black bears are reproductively compatible with several other bear species and occasionally produce hybrid offspring. According to Jack Hanna 's Monkeys on the Interstate , a bear captured in Sanford, Florida ,
19965-412: The late 20th century. The BAFTA winning 1993 documentary series The Ark by Molly Dineen chronicled this period of time. One benefit of the 'swell of public support' was the development of volunteer staff. Volunteers who give one day a week to assist the running of London Zoo, wearing red pullovers, are employed by both Education and Animal care. During the covid epidemic , which started in 2020,
20130-469: The latter species. When initially emerging from hibernation, they will seek to feed on carrion from winter-killed animals and newborn ungulates . As the spring temperature warms, American black bears seek new shoots of many plant species, especially new grasses , wetland plants and forbs . Young shoots and buds from trees and shrubs during the spring period are important to bears emerging from hibernation, as they assist in rebuilding muscle and strengthening
20295-557: The males average 136 kg (300 lb) and females 72.6 kg (160 lb). It was found in Nevada and the Lake Tahoe region that bears closer to urban regions were significantly heavier than their arid-country dwelling counterparts, with males near urban areas averaging 138 kg (304 lb) against wild-land males which averaged 115.5 kg (255 lb) whereas peri-urban females averaged 97.9 kg (216 lb) against
20460-459: The metabolic changes that allow black bears to remain dormant for months without eating, drinking, urinating or defecating, most biologists have redefined mammalian hibernation as "specialized, seasonal reduction in metabolism concurrent with scarce food and cold weather". American black bears are now considered highly efficient hibernators. The physiology of American black bears in the wild is closely related to that of bears in captivity. Understanding
20625-403: The metabolic rate can drop to a quarter of the bear's (nonhibernating) basal metabolic rate . These reductions in metabolic rate and heart rate do not appear to decrease the bear's ability to heal injuries during hibernation. Their circadian rhythm stays intact during hibernation. This allows the bear to sense the changes in the day based on the ambient temperature caused by the sun's position in
20790-434: The most common sounds and are made in cordial situations to conspecifics, offspring and occasionally humans. When at ease, they produce a loud rumbling hum. During times of fear or nervousness, bears may moan, huff or blow air. Warning sounds include jaw-clicking and lip-popping. In aggressive interactions, black bears produce guttural pulsing calls that may sound like growling. Cubs squeal, bawl or scream when anxious and make
20955-749: The most recent aquarium was built in 1921 next to and beneath the Mappin Terraces and was officially opened by King George V and his wife Queen Mary in April 1924. The collection in 1853 included 58 fish species and 200 invertebrate species. The aquarium was separated into three halls, each home to different types of fish and other aquatic wildlife. The first hall primarily contained freshwater species such as rudd and European eels , as well as some saltwater species involved in various conservation projects and captive-breeding programmes, such as broad sea fans , uarus and seahorses . The second hall displayed various species of coral reef fish from around
21120-414: The muscular strength compared to that of a well-nourished, inactive human. The bear's bone mass does not change in geometry or mineral composition during hibernation, which implies that the bear's conservation of bone mass during hibernation is caused by a biological mechanism. During hibernation American black bears retain all excretory waste, leading to the development of a hardened mass of fecal material in
21285-472: The now extinct quagga and thylacine . The Society was granted a royal charter in 1829 by King George IV , and in 1847 the zoo opened to the public to aid funding. It was believed that tropical animals could not survive outside in London's cold weather, so they were all kept indoors until 1902, when Peter Chalmers Mitchell was appointed secretary of the Society. He set about a major reorganisation of
21450-483: The numerous fungi species of all the concepts studied. Versions of the phylogenetic species concept that emphasise monophyly or diagnosability may lead to splitting of existing species, for example in Bovidae , by recognising old subspecies as species, despite the fact that there are no reproductive barriers, and populations may intergrade morphologically. Others have called this approach taxonomic inflation , diluting
21615-593: The paper is accepted for publication. The type material is usually held in a permanent repository, often the research collection of a major museum or university, that allows independent verification and the means to compare specimens. Describers of new species are asked to choose names that, in the words of the International Code of Zoological Nomenclature , are "appropriate, compact, euphonious, memorable, and do not cause offence". Books and articles sometimes intentionally do not identify species fully, using
21780-674: The person who named the species, while the antonym sensu lato ("in the broad sense") denotes a wider usage, for instance including other subspecies. Other abbreviations such as "auct." ("author"), and qualifiers such as "non" ("not") may be used to further clarify the sense in which the specified authors delineated or described the species. Species are subject to change, whether by evolving into new species, exchanging genes with other species, merging with other species or by becoming extinct. The evolutionary process by which biological populations of sexually-reproducing organisms evolve to become distinct or reproductively isolated as species
21945-472: The physiology of bears in the wild is vital to the bear's success in captivity. The bears enter their dens in October and November, although in the southernmost areas of their range (i.e. Florida, Mexico, the southeastern United States ), only pregnant females and mothers with yearling cubs will enter hibernation. Prior to that time, they can put on up to 14 kg (30 lb) of body fat to get them through
22110-405: The predominance of black or brown/blonde specimens by location: American black bears have eyesight and hearing comparable to that of humans. Their keenest sense is smell, which is about seven times more sensitive than a domestic dog's. They are excellent and strong swimmers, swimming for pleasure and to feed (largely on fish). They regularly climb trees to feed, escape enemies and hibernate. Four of
22275-559: The proper equipment or understanding to care for them. The dedicated London Aquarium , unconnected with ZSL, opened in 1997. The Zoo's smaller aquarium closed on 22 October 2019; some of the aquatic creatures were moved to a new aquarium at Whipsnade Zoo, while others were set to be housed in a new corals exhibit in the Tiny Giants building in 2020. Animal Adventure, formerly known as the Ambika Paul Children's Zoo,
22440-474: The public. Old Martin was a large grizzly bear , the first in Britain, moved to the zoo with many other animals from the Royal Menagerie, Tower of London when it was closed in 1832. The zoo was home to the only living quagga ever to be photographed before the species became extinct in the wild due to hunting in southern Africa in about 1870. Other now extinct species the zoo once held were
22605-487: The result of misclassification leading to questions on whether there really are any ring species. The commonly used names for kinds of organisms are often ambiguous: "cat" could mean the domestic cat, Felis catus , or the cat family, Felidae . Another problem with common names is that they often vary from place to place, so that puma, cougar, catamount, panther, painter and mountain lion all mean Puma concolor in various parts of America, while "panther" may also mean
22770-586: The ring. Ring species thus present a difficulty for any species concept that relies on reproductive isolation. However, ring species are at best rare. Proposed examples include the herring gull – lesser black-backed gull complex around the North pole, the Ensatina eschscholtzii group of 19 populations of salamanders in America, and the greenish warbler in Asia, but many so-called ring species have turned out to be
22935-522: The same period as the giant and lesser short-faced bears ( Arctodus simus and A. pristinus , respectively) and the Florida spectacled bear ( Tremarctos floridanus ). These tremarctine bears evolved from bears that had emigrated from Asia to the Americas 7–8 mya. The giant and lesser short-faced bears are thought to have been heavily carnivorous and the Florida spectacled bear more herbivorous, while
23100-508: The same species. This concept was narrowed in 2006 to a similarity of 98.7%. The average nucleotide identity (ANI) method quantifies genetic distance between entire genomes , using regions of about 10,000 base pairs . With enough data from genomes of one genus, algorithms can be used to categorize species, as for Pseudomonas avellanae in 2013, and for all sequenced bacteria and archaea since 2020. Observed ANI values among sequences appear to have an "ANI gap" at 85–95%, suggesting that
23265-529: The same species. When two species names are discovered to apply to the same species, the older species name is given priority and usually retained, and the newer name considered as a junior synonym, a process called synonymy . Dividing a taxon into multiple, often new, taxa is called splitting . Taxonomists are often referred to as "lumpers" or "splitters" by their colleagues, depending on their personal approach to recognising differences or commonalities between organisms. The circumscription of taxa, considered
23430-494: The several months during which they fast. Hibernation typically lasts 3–8 months, depending on regional climate. Hibernating bears spend their time in hollowed-out dens in tree cavities, under logs or rocks, in banks, caves, or culverts, and in shallow depressions. Although naturally-made dens are occasionally used, most dens are dug out by the bear. During their time in hibernation, an American black bear's heart rate drops from 40 to 50 beats per minute to 8 beats per minute, and
23595-485: The skeleton and are often the only digestible foods available at that time. During summer, the diet largely comprises fruits, especially berries and soft masts such as buds and drupes . During the autumn hyperphagia , feeding becomes virtually the full-time task. Hard masts become the most important part of the diet in autumn and may even partially dictate the species' distribution. Favored masts such as hazelnuts , oak acorns and whitebark pine nuts may be consumed by
23760-588: The sky. It has also been shown that ambient light exposure and low disturbance levels (that is to say, wild bears in ambient light conditions) directly correlate with their activity levels. The bear keeping track of the changing days allows it to awaken from hibernation at the appropriate time of year to conserve as much energy as possible. The hibernating bear does not display the same rate of muscle and bone atrophy relative to other nonhibernatory animals that are subject to long periods of inactivity due to ailment or old age. A hibernating bear only loses approximately half
23925-492: The smallest bear species in North America , large males exceed the size of other bear species, except the brown bear and the polar bear. Weight tends to vary according to age, sex, health and season. Seasonal variation in weight is very pronounced: in autumn, their pre-den weight tends to be 30% higher than in spring, when black bears emerge from their dens. Bears on the East Coast tend to be heavier on average than those on
24090-637: The southern farmlands of Alberta , Saskatchewan and Manitoba ; they have been extirpated on Prince Edward Island since 1937. Surveys taken in the mid-1990s found the Canadian black bear population to be between 396,000 and 476,000 in seven provinces; this estimate excludes populations in New Brunswick , the Northwest Territories , Nova Scotia and Saskatchewan . All provinces indicated stable populations of American black bears over
24255-506: The species concept and making taxonomy unstable. Yet others defend this approach, considering "taxonomic inflation" pejorative and labelling the opposing view as "taxonomic conservatism"; claiming it is politically expedient to split species and recognise smaller populations at the species level, because this means they can more easily be included as endangered in the IUCN red list and can attract conservation legislation and funding. Unlike
24420-410: The war, members of the armed forces paid half price for entry, and the wounded entered free of charge. In 1962, 'Caroline', an Arabian oryx, was lent to Phoenix Zoo , Arizona , US, in the world's first international co-operative breeding programme. Today, the zoo participates in breeding programmes for over 130 species. In the 1980s, London Zoo housed 8,000 animals of more than 900 species, and in
24585-489: The wild is 18 years, though it is quite possible for wild individuals to survive for more than 23 years. The record age of a wild individual was 39 years, while that in captivity was 44 years. The average annual survival rate is variable, ranging from 86% in Florida to 73% in Virginia and North Carolina. In Minnesota, 99% of wintering adult bears were able to survive the hibernation cycle in one study. Remarkably,
24750-540: The wild. It is difficult to define a species in a way that applies to all organisms. The debate about species concepts is called the species problem. The problem was recognised even in 1859, when Darwin wrote in On the Origin of Species : I was much struck how entirely vague and arbitrary is the distinction between species and varieties. He went on to write: No one definition has satisfied all naturalists; yet every naturalist knows vaguely what he means when he speaks of
24915-510: The winter is mild enough, they may wake up and forage for food. Females also give birth in February and nurture their cubs until the snow melts. During winter, American black bears consume 25–40% of their body weight. The footpads peel off while they sleep, making room for new tissue. Many of the physiological changes an American black bear exhibits during hibernation are retained slightly post-hibernation. Upon exiting hibernation, bears retain
25080-440: The world's largest captive male and female American black bears. Ted, the male, weighed 431–453.5 kg (950–1,000 lb) in the fall of 2006. Honey, the female, weighed 219.6 kg (484 lb) in the fall of 2007. The fur is soft, with dense underfur and long, coarse, thick guard hairs. The fur is not as shaggy or coarse as that of brown bears. American black bear skins can be distinguished from those of Asian black bears by
25245-511: The world, such as clownfish , copperband butterflyfish and regal tangs , as well as real coral. The third hall housed species native to the Amazon River , including red-bellied piranhas , angelfish , arapaimas and ocellate river stingrays . In addition to the three halls, the aquarium also featured the "Big Fish Tank". This tank housed large fish species that were all former pets. They had to be rescued because their owners did not have
25410-495: The zoo being faced with closure in the 1980s. Due to the public change of attitude to animals kept in captivity and unsuitably cramped space, the zoo also suffered dwindling visitor numbers. However, when it was announced that London Zoo would close in 1991, a swell of public support in visitors and donations allowed the zoo to continue its work, attempt to balance its books and take on the huge task of restoring its buildings and creating environments more suitable for animal behaviour in
25575-462: The zoo from Jardin des Plantes in Paris. His name, possibly from Jambo , Swahili for hello , became an epithet for anything of large size, such as Boeing 's 747 Jumbo jet . Jumbo became a crowd favourite due to his size, and would give rides to children on his back, including those of Queen Victoria . The sale of Jumbo sent the citizens of London into a panic, and 100,000 schoolchildren wrote to
25740-413: The zoo was closed from 21 March to 15 June 2020. This closure resulted in a "perilous financial position" for the zoo due to the loss of revenue. The Snowdon Aviary was redeveloped as Monkey Valley , opening in 2022. The Zoo has many named areas and attractions. Several of them are available for hire outside the zoo's opening hours, including The Terrace, Penguin Beach, Ninos cove, Tiny Giants, Land of
25905-530: The £3 tickets were not cannibalising demand for full-price tickets. However, they intended to maintain the £3 scheme if further funding became available. The director general of the Zoological Society of London described the result of the scheme as a "brilliant development", despite the queues and challenges. Throughout its history, the zoo has had many well-known residents. Those individuals could have been scientifically important or simply beloved by
26070-647: Was established in 2009. It is a dedicated area for children, featuring playgrounds and a water fountain. It was built after a child who loved visiting the zoo with her family, Ambika Paul, died from cancer. Her parents donated £1,000,000 to the zoo to build a children's zoo in her honour. Many of the animals in Animal Adventure are domestic animals, such as llamas , alpacas , and goats , as well as kunekune pigs . Exotic species on display include Cape porcupines , South American coatis , and yellow mongooses . At approximately 6 am on Saturday, 23 December 2017,
26235-473: Was opened by Sir David Attenborough in July 2004. The zoo used to own two Komodo dragons, a female named Rinka and a male named Raja. Raja was filmed in his exhibit for an action sequence in the 2012 James Bond film Skyfall . A new male dragon called Ganas (one of the parthenogenic hatchlings from Chester Zoo ) moved to London in 2015 after the previous dragons died. Their enclosure is designed to resemble
26400-455: Was originally built to house rhinos and elephants . However, after an accident in which a keeper was killed in 2001, the animals were relocated to Whipsnade Zoo, and since then, the building has housed camels and porcupines . At one point, it was also part of Tiger Territory when it housed bearded pigs and Malayan tapirs . It is now its own exhibit, known as The Cassons, and it houses a family of red river hogs and babirusas . Opened by
26565-458: Was successful and was later extended to allow anyone who received certain benefits to buy tickets for £3, about a tenth of the full price, leading to visits by thousands of families, and long queues which were controlled by requiring pre-booking and capping numbers. Some visitors who were not receiving benefits complained about the crowds. As of February 2023 the Zoo was trying to ensure that
26730-706: Was the cattle-killer shot in December 1921 on the Moqui Reservation in Arizona . The record-sized American black bear from New Jersey was shot in Morris County December 2011 and scaled 376.5 kg (830 lb). The Pennsylvania state record weighed 399 kg (880 lb) and was shot in November 2010 in Pike County . The North American Bear Center, located in Ely, Minnesota , is home to
26895-638: Was the first hippopotamus to be seen in Europe since the Roman Empire and the first in England since prehistoric times. The hippo arrived at the London Zoo in May 1850 as a gift from the Ottoman Viceroy of Egypt in exchange for some greyhounds and deerhounds. Obaysch led to a doubling of the zoo's visitors that year. In 1865, Jumbo , the largest elephant known at the time, was transferred to
27060-487: Was thought to have been the offspring of an escaped female Asian black bear and a male American black bear. In 1859, an American black bear and a Eurasian brown bear were bred together in the London Zoological Gardens , but the three cubs that were born died before they reached maturity. In The Variation of Animals and Plants Under Domestication , Charles Darwin noted: In the nine-year Report it
27225-594: Was unable to determine whether it was a large American black bear or a grizzly bear. Sixteen subspecies are traditionally recognized; however, a recent genetic study does not support designating some of these, such as the Florida black bear, as distinct subspecies. Listed alphabetically according to subspecific name: Historically, American black bears occupied the majority of North America's forested regions. Today, they are primarily limited to sparsely settled, forested areas. American black bears currently inhabit much of their original Canadian range, though they seldom occur in
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