135-445: A pet , or companion animal , is an animal kept primarily for a person's company or entertainment rather than as a working animal , livestock , or a laboratory animal . Popular pets are often considered to have attractive/ cute appearances, intelligence , and relatable personalities, but some pets may be taken in on an altruistic basis (such as a stray animal) and accepted by the owner regardless of these characteristics. Two of
270-571: A clade , meaning that they arose from a single common ancestor . Over 1.5 million living animal species have been described , of which around 1.05 million are insects , over 85,000 are molluscs , and around 65,000 are vertebrates . It has been estimated there are as many as 7.77 million animal species on Earth. Animal body lengths range from 8.5 μm (0.00033 in) to 33.6 m (110 ft). They have complex ecologies and interactions with each other and their environments, forming intricate food webs . The scientific study of animals
405-399: A gastrula with a digestive chamber and two separate germ layers , an external ectoderm and an internal endoderm . In most cases, a third germ layer, the mesoderm , also develops between them. These germ layers then differentiate to form tissues and organs. Repeated instances of mating with a close relative during sexual reproduction generally leads to inbreeding depression within
540-487: A rite of passage , which may or may not correspond to the time of puberty. Children generally have fewer rights than adults and are classed as unable to make serious decisions, and legally must always be under the care of a responsible adult or child custody , whether their parents divorce or not. Early childhood follows the infancy stage and begins with toddlerhood when the child begins speaking or taking steps independently. While toddlerhood ends around age 3 when
675-426: A UN report, warfare is preventing 28 million children worldwide from receiving an education, due to the risk of sexual violence and attacks in schools. Other factors that keep children out of school include poverty, child labor, social attitudes, and long distances to school. Social attitudes toward children differ around the world in various cultures and change over time. A 1988 study on European attitudes toward
810-518: A cat had at least one person educated to degree level, compared with 38.4% of homes with dogs. There are approximately 86.4 million pet cats and approximately 78.2 million pet dogs in the United States, and a United States 2007–2008 survey showed that dog-owning households outnumbered those owning cats, but that the total number of pet cats was higher than that of dogs. The same was true for 2011. In 2013, pets outnumbered children four to one in
945-561: A clade Xenambulacraria for the Xenacoelamorpha + Ambulacraria; this is either within Deuterostomia, as sister to Chordata, or the Deuterostomia are recovered as paraphyletic, and Xenambulacraria is sister to the proposed clade Centroneuralia , consisting of Chordata + Protostomia. Eumetazoa , a clade which contains Ctenophora and ParaHoxozoa , has been proposed as a sister group to Porifera . A competing hypothesis
1080-466: A deliberate choice not to drink or use drugs, and to avoid contact with substance abusers or those involved in any criminal activity for fear of being separated from their pet. Additionally, many refuse to house in shelters if their pet is not allowed to stay with them. Health risks that are associated with pets include: The European Convention for the Protection of Pet Animals is a 1987 treaty of
1215-455: A demand for animal goods such as accessories and guides for pet keeping. Pet care developed into a big business by the end of the nineteenth century. Profiteers also sought out pet stealing as a means for economic gain. Utilizing the affection that owners had for their pets, professional dog stealers would capture animals and hold them for ransom. The development of dog stealing reflects the increased value of pets. Pets gradually became defined as
1350-418: A dog named Bella. Animal Animals are multicellular , eukaryotic organisms in the biological kingdom Animalia ( / ˌ æ n ɪ ˈ m eɪ l i ə / ). With few exceptions, animals consume organic material , breathe oxygen , have myocytes and are able to move , can reproduce sexually , and grow from a hollow sphere of cells, the blastula , during embryonic development . Animals form
1485-400: A fundamental change in behavior to facilitate a close co-existence with humans. Some species may have been bred in captivity for a considerable length of time, but are still not recognized as domesticated . Generally, wild animals are recognized as not suitable to keep as pets, and this practice is completely banned in many places. In other areas, certain species are allowed to be kept, and it
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#17327903440361620-400: A higher risk of developing diabetes, liver problems, joint pain, kidney failure, and cancer. Lack of exercise and high-caloric diets are considered to be the primary contributors to pet obesity. It is widely believed among the public, and among many scientists, that pets probably bring mental and physical health benefits to their owners; a 1987 NIH statement cautiously argued that existing data
1755-488: A hurried and pressured style may limit the protective benefits they would gain from child-driven play. The initiation of play in a classroom setting allows teachers and students to interact through playfulness associated with a learning experience. Therefore, playfulness aids the interactions between adults and children in a learning environment. “Playful Structure” means to combine informal learning with formal learning to produce an effective learning experience for children at
1890-486: A longer history than generally recognized, with its roots traceable to similarly imaginative constructions of childhood circulating, for example, in the neo-platonic poetry of seventeenth-century metaphysical poet Henry Vaughan (e.g., "The Retreate", 1650; "Childe-hood", 1655). Such views contrasted with the stridently didactic, Calvinist views of infant depravity. With the onset of industrialisation in England in 1760,
2025-539: A new family ideology centred around the upbringing of children. Puritanism stressed the importance of individual salvation and concern for the spiritual welfare of children. The modern notion of childhood with its own autonomy and goals began to emerge during the 18th-century Enlightenment and the Romantic period that followed it. Jean Jacques Rousseau formulated the romantic attitude towards children in his famous 1762 novel Emile: or, On Education . Building on
2160-399: A pet may also help people achieve health goals, such as lowered blood pressure, or mental goals, such as decreased stress. There is evidence that having a pet can help a person lead a longer, healthier life. In a 1986 study of 92 people hospitalized for coronary ailments, within a year, 11 of the 29 patients without pets had died, compared to only 3 of the 52 patients who had pets. Having pet(s)
2295-1109: A population due to the increased prevalence of harmful recessive traits. Animals have evolved numerous mechanisms for avoiding close inbreeding . Some animals are capable of asexual reproduction , which often results in a genetic clone of the parent. This may take place through fragmentation ; budding , such as in Hydra and other cnidarians ; or parthenogenesis , where fertile eggs are produced without mating , such as in aphids . Animals are categorised into ecological groups depending on their trophic levels and how they consume organic material . Such groupings include carnivores (further divided into subcategories such as piscivores , insectivores , ovivores , etc.), herbivores (subcategorized into folivores , graminivores , frugivores , granivores , nectarivores , algivores , etc.), omnivores , fungivores , scavengers / detritivores , and parasites . Interactions between animals of each biome form complex food webs within that ecosystem . In carnivorous or omnivorous species, predation
2430-487: A relationship with a parent (such as sons and daughters of any age) or, metaphorically , an authority figure , or signify group membership in a clan, tribe, or religion; it can also signify being strongly affected by a specific time, place, or circumstance, as in "a child of nature" or "a child of the Sixties." In the biological sciences, a child is usually defined as a person between birth and puberty, or between
2565-509: A requirement for having a pet, and not a result. Dogs trained to be guide dogs can help people with vision impairment. Dogs trained in the field of Animal-Assisted Therapy (AAT) can also benefit people with other disabilities. People residing in a long-term care facility, such as a hospice or nursing home, may experience health benefits from pets. Pets help them to cope with the emotional issues related to their illness. They also offer physical contact with another living creature, something that
2700-506: A single opening, which serves as both mouth and anus. Animals in both phyla have distinct tissues, but these are not organised into discrete organs . They are diploblastic , having only two main germ layers, ectoderm and endoderm. Children A child ( pl. children ) is a human being between the stages of birth and puberty , or between the developmental period of infancy and puberty. The term may also refer to an unborn human being. In English-speaking countries,
2835-716: A stage where they make new friends and gain new skills, which will enable them to become more independent and enhance their individuality. During middle childhood, children enter the school years, where they are presented with a different setting than they are used to. This new setting creates new challenges and faces for children. Upon the entrance of school, mental disorders that would normally not be noticed come to light. Many of these disorders include: autism , dyslexia , dyscalculia , and ADHD . Special education , least restrictive environment , response to intervention and individualized education plans are all specialized plans to help children with disabilities. Middle childhood
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#17327903440362970-536: A week with electronic media”. Research in 2007 has drawn a correlation between the declining number of National Park visits in the U.S. and increasing consumption of electronic media by children. The media has accelerated the trend for children's nature disconnection by deemphasizing views of nature, as in Disney films. The age at which children are considered responsible for their society-bound actions (e. g. marriage, voting, etc.) has also changed over time, and this
3105-496: A young age. Even though play is considered to be the most important to optimal child development, the environment affects their play and therefore their development. Poor children confront widespread environmental inequities as they experience less social support, and their parents are less responsive and more authoritarian. Children from low income families are less likely to have access to books and computers which would enhance their development. Children's street culture refers to
3240-464: Is a consumer–resource interaction where the predator feeds on another organism, its prey , who often evolves anti-predator adaptations to avoid being fed upon. Selective pressures imposed on one another lead to an evolutionary arms race between predator and prey, resulting in various antagonistic/ competitive coevolutions . Almost all multicellular predators are animals. Some consumers use multiple methods; for example, in parasitoid wasps ,
3375-426: Is a medically approved class of therapy animals that are brought to visit confined humans, such as children in hospitals or elders in nursing homes . Pet therapy utilizes trained animals and handlers to achieve specific physical, social, cognitive, or emotional goals with patients. People most commonly get pets for companionship, to protect a home or property, or because of the perceived beauty or attractiveness of
3510-433: Is a stage in embryonic development that is unique to animals, allowing cells to be differentiated into specialised tissues and organs. All animals are composed of cells, surrounded by a characteristic extracellular matrix composed of collagen and elastic glycoproteins . During development, the animal extracellular matrix forms a relatively flexible framework upon which cells can move about and be reorganised, making
3645-402: Is commonly defined as ages 9–12, ending with the major onset of puberty, with markers such as menarche , spermarche , and the peak of height velocity occurring. These changes usually occur between ages 11 and 14. It may also be defined as the 2-year period before the major onset of puberty. Preadolescence can bring its own challenges and anxieties. Preadolescent children have a different view of
3780-489: Is controlled by adults, children acquiesce to adult rules and concerns and lose some of the benefits play offers them. This is especially true in developing creativity, leadership, and group skills. Play is considered to be very important to optimal child development that it has been recognized by the United Nations Commission on Human Rights as a right of every child. Children who are being raised in
3915-463: Is disputed, as they might be water-escape or other structures. Animals are monophyletic , meaning they are derived from a common ancestor. Animals are the sister group to the choanoflagellates , with which they form the Choanozoa . The dates on the phylogenetic tree indicate approximately how many millions of years ago ( mya ) the lineages split. Ros-Rocher and colleagues (2021) trace
4050-549: Is estimated that there are approximately 45 million pets in Italy. This includes 7 million dogs, 7.5 million cats, 16 million fish, 12 million birds, and 10 million snakes. A 2007 survey by the University of Bristol found that 26% of UK households owned cats and 31% owned dogs, estimating total domestic populations of approximately 10.3 million cats and 10.5 million dogs in 2006. The survey also found that 47.2% of households with
4185-530: Is illegal in the Netherlands for owners to kill their own cats and dogs kept as pets. Parakeets, guinea pigs, hamsters and other animals may still be killed by their owners, but nonetheless when owners mistreat their companion animals (for example, in the process of killing them), the owners can still be prosecuted under Dutch law. Pets have a considerable environmental impact, especially in countries where they are common or held in high densities. For instance,
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4320-405: Is illegal. There is a market for illegal pets. Domesticated pets are the most common. A domesticated animal is a species that has been made fit for a human environment, by being consistently kept in captivity and selectively bred over a long enough period of time that it exhibits marked differences in behavior and appearance from its wild relatives. Domestication contrasts with taming , which
4455-450: Is known as zoology , and the study of animal behaviour is known as ethology . The animal kingdom is divided into five infrakingdoms / superphyla , namely Porifera , Ctenophora , Placozoa , Cnidaria and Bilateria . Most living animal species belong to the infrakingdom Bilateria, a highly proliferative clade whose members have a bilaterally symmetric body plan , and the vast majority of bilaterians belong to two large superphyla :
4590-590: Is natural, the rate of PTSD occurs in anywhere from 3 to 87 percent of affected children. However, rates of PTSD for children living in chronic conflict conditions varies from 15 to 50 percent. Child protection (also called child welfare) is the safeguarding of children from violence, exploitation, abuse, and neglect. It involves identifying signs of potential harm. This includes responding to allegations or suspicions of abuse, providing support and services to protect children, and holding those who have harmed them accountable. The primary goal of child protection
4725-858: Is often missing in an elder's life. Pets for nursing homes are chosen based on the size of the pet, the amount of care that the breed needs, and the population and size of the care institution. Appropriate pets go through a screening process and, if it is a dog, additional training programs to become a therapy dog . There are three types of therapy dogs: facility therapy dogs, animal-assisted therapy dogs, and therapeutic visitation dogs. The most common therapy dogs are therapeutic visitation dogs. These dogs are household pets whose handlers take time to visit hospitals, nursing homes, detention facilities, and rehabilitation facilities. Different pets require varying amounts of attention and care; for example, cats may have lower maintenance requirements than dogs. In addition to providing health benefits for their owners, pets also impact
4860-455: Is often seen as an integral part of coming of age . It is usually thought of as an experience or period in a child's life that widens their awareness of evil, pain or the world around them. This theme is demonstrated in the novels To Kill a Mockingbird and Lord of the Flies . The fictional character Peter Pan was the embodiment of a childhood that never ends. Children's health includes
4995-808: Is often used to refer only to nonhuman animals. The term metazoa is derived from Ancient Greek μετα ( meta ) 'after' (in biology, the prefix meta- stands for 'later') and ζῷᾰ ( zōia ) 'animals', plural of ζῷον zōion 'animal'. Animals have several characteristics that set them apart from other living things. Animals are eukaryotic and multicellular . Unlike plants and algae , which produce their own nutrients , animals are heterotrophic , feeding on organic material and digesting it internally. With very few exceptions, animals respire aerobically . All animals are motile (able to spontaneously move their bodies) during at least part of their life cycle , but some animals, such as sponges , corals , mussels , and barnacles , later become sessile . The blastula
5130-422: Is only produced by sponges and pelagophyte algae. Its likely origin is from sponges based on molecular clock estimates for the origin of 24-ipc production in both groups. Analyses of pelagophyte algae consistently recover a Phanerozoic origin, while analyses of sponges recover a Neoproterozoic origin, consistent with the appearance of 24-ipc in the fossil record. The first body fossils of animals appear in
5265-548: Is reflected in the way they are treated in courts of law. In Roman times, children were regarded as not culpable for crimes, a position later adopted by the Church. In the 19th century, children younger than seven years old were believed incapable of crime. Children from the age of seven forward were considered responsible for their actions. Therefore, they could face criminal charges, be sent to adult prison, and be punished like adults by whipping, branding or hanging. However, courts at
5400-675: Is responsible for the release of up to 64 ± 16 million tons CO 2 -equivalent methane and nitrous oxide , two powerful greenhouse gasses . Americans are the largest pet owners in the world, but pet ownership in the US has considerable environmental costs. While many people have kept many different species of animals in captivity over the course of human history, only a relative few have been kept long enough to be considered domesticated . Other types of animal, notably monkeys , have never been domesticated but are still sold and kept as pets. Some wild animals are kept as pets, such as tigers, even though this
5535-439: Is significant as Egyptians considered names to have magical properties. Throughout the 17th and 18th-century pet keeping in the modern sense gradually became accepted throughout Britain . Initially, aristocrats kept dogs for both companionship and hunting. Thus, pet keeping was a sign of elitism within society. By the 19th century, the rise of the middle class stimulated the development of pet keeping and it became inscribed within
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5670-576: Is simply when an un-domesticated, wild animal has become tolerant of human presence, and perhaps even enjoys it. Large mammals that might be kept as pets include alpaca , camel , cattle , donkey , goat , horse , llama , pig , and sheep . Small mammals that might be kept as pets include: ferret , hedgehog , rabbit , sugar glider , and rodents , including rat , mouse , hamster , guinea pig , gerbil , and chinchilla . Other mammals include cat , dog , monkey , and domesticated silver fox . Birds kept as pets include companion parrots like
5805-547: Is the Benthozoa clade, which would consist of Porifera and ParaHoxozoa as a sister group of Ctenophora . Several animal phyla lack bilateral symmetry. These are the Porifera (sea sponges), Placozoa , Cnidaria (which includes jellyfish , sea anemones , and corals), and Ctenophora (comb jellies). Sponges are physically very distinct from other animals, and were long thought to have diverged first, representing
5940-428: Is the time when children begin to understand responsibility and are beginning to be shaped by their peers and parents. Chores and more responsible decisions come at this time, as do social comparison and social play. During social play, children learn from and teach each other, often through observation. Preadolescence is a stage of human development following early childhood and preceding adolescence . Preadolescence
6075-447: Is through play that children at a very early age engage and interact in the world around them. Play allows children to create and explore a world they can master, conquering their fears while practicing adult roles, sometimes in conjunction with other children or adult caregivers. Undirected play allows children to learn how to work in groups, to share, to negotiate, to resolve conflicts, and to learn self-advocacy skills. However, when play
6210-471: Is to ensure that all children are safe and free from harm or danger. Child protection also works to prevent future harm by creating policies and systems that identify and respond to risks before they lead to harm. In order to achieve these goals, research suggests that child protection services should be provided in a holistic way. This means taking into account the social, economic, cultural, psychological, and environmental factors that can contribute to
6345-497: Is usually required for the owner to obtain a permit. It is considered animal cruelty by some, as most often, wild animals require precise and constant care that is very difficult to meet in captive conditions. Many large and instinctively aggressive animals are extremely dangerous, and numerous times have they killed their handlers. Archaeology suggests that human ownership of dogs as pets may date back to at least 12,000 years ago. Ancient Greeks and Romans would openly grieve for
6480-622: The Cambrian explosion , which began around 539 million years ago (Mya), and most classes during the Ordovician radiation 485.4 Mya. 6,331 groups of genes common to all living animals have been identified; these may have arisen from a single common ancestor that lived about 650 Mya during the Cryogenian period. Historically, Aristotle divided animals into those with blood and those without . Carl Linnaeus created
6615-496: The Council of Europe – but accession to the treaty is open to all states in the world – to promote the welfare of pet animals and ensure minimum standards for their treatment and protection. It went into effect on 1 May 1992, and as of June 2020, it has been ratified by 24 states. Pets have commonly been considered private property , owned by individual persons . Many legal protections have existed (historically and today) with
6750-619: The Ediacaran , represented by forms such as Charnia and Spriggina . It had long been doubted whether these fossils truly represented animals, but the discovery of the animal lipid cholesterol in fossils of Dickinsonia establishes their nature. Animals are thought to have originated under low-oxygen conditions, suggesting that they were capable of living entirely by anaerobic respiration , but as they became specialized for aerobic metabolism they became fully dependent on oxygen in their environments. Many animal phyla first appear in
6885-530: The Netherlands , the government publishes white lists and black lists (called 'positive' and 'negative lists') with animal species that are designated to be appropriate to be kept as pets (positive) or not (negative). The Dutch Ministry of Economic Affairs and Climate Policy originally established its first positive list ( positieflijst ) per 1 February 2015 for a set of 100 mammals (including cats, dogs and production animals ) deemed appropriate as pets on
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#17327903440367020-485: The Wnt and TGF-beta signalling pathways which may have enabled animals to become multicellular by providing a pattern for the body's system of axes (in three dimensions), and another 7 are for transcription factors including homeodomain proteins involved in the control of development . Giribet and Edgecombe (2020) provide what they consider to be a consensus internal phylogeny of the animals, embodying uncertainty about
7155-665: The armadillo , the sloth , the European hare , and the wild boar . In January 2011, the Belgian Federal Agency for the Safety of the Food Chain stated that people are not allowed to kill miscellaneous or unknown cats walking in their garden, but "nowhere in the law does it say that you can't eat your cat, dog, rabbit, fish or whatever. You just have to kill them in an animal-friendly way." Since 1 July 2014, it
7290-511: The bourgeois culture. As the popularity of pet-keeping in the modern sense rose during the Victorian era , animals became a fixture within urban culture as commodities and decorative objects. Pet keeping generated a commercial opportunity for entrepreneurs. By the mid-19th century, nearly twenty thousand street vendors in London dealt with live animals. The popularity of animals also developed
7425-680: The budgie and cockatiel , fowl such as chickens , turkeys , ducks , geese , and quail , columbines , and passerines , namely finches and canaries . Fish kept as pets include: goldfish , koi , Siamese fighting fish ( Betta ), barb , guppy , molly , Japanese rice fish (Medaka), and oscar . Arthropods kept as pets include bees , such as honey bees and stingless bees , Silk moth , and ant farms . Reptiles and amphibians kept as pets include snakes , turtles , axolotl , frogs and salamanders . Wild animals are kept as pets. The term wild in this context specifically applies to any species of animal which has not undergone
7560-402: The equine and bovine group include the largest companion animals. Pets provide their owners, or guardians, both physical and emotional benefits. Walking a dog can provide both the human and the dog with exercise, fresh air, and social interaction . Pets can give companionship to people who are living alone or elderly adults who do not have adequate social interaction with other people. There
7695-665: The evolutionary relationships between taxa . Humans make use of many other animal species for food (including meat , eggs , and dairy products ), for materials (such as leather , fur , and wool ), as pets and as working animals for transportation , and services . Dogs , the first domesticated animal, have been used in hunting , in security and in warfare , as have horses , pigeons and birds of prey ; while other terrestrial and aquatic animals are hunted for sports, trophies or profits. Non-human animals are also an important cultural element of human evolution , having appeared in cave arts and totems since
7830-473: The fossil record during the Cambrian explosion , starting about 539 million years ago, in beds such as the Burgess shale . Extant phyla in these rocks include molluscs , brachiopods , onychophorans , tardigrades , arthropods , echinoderms and hemichordates , along with numerous now-extinct forms such as the predatory Anomalocaris . The apparent suddenness of the event may however be an artifact of
7965-497: The lobe-finned fish Tiktaalik started to move on to land in the late Devonian , about 375 million years ago. Animals occupy virtually all of earth's habitats and microhabitats, with faunas adapted to salt water, hydrothermal vents, fresh water, hot springs, swamps, forests, pastures, deserts, air, and the interiors of other organisms. Animals are however not particularly heat tolerant ; very few of them can survive at constant temperatures above 50 °C (122 °F) or in
8100-500: The protostomes , which includes organisms such as arthropods , molluscs , flatworms , annelids and nematodes ; and the deuterostomes , which include echinoderms , hemichordates and chordates , the latter of which contains the vertebrates . The much smaller basal phylum Xenacoelomorpha have an uncertain position within Bilateria. Animals first appear in the fossil record in the late Cryogenian period and diversified in
8235-531: The tabula rasa , which considered the mind at birth to be a "blank slate". A corollary of this doctrine was that the mind of the child was born blank, and that it was the duty of the parents to imbue the child with correct notions. During the early period of capitalism , the rise of a large, commercial middle class, mainly in the Protestant countries of the Dutch Republic and England , brought about
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#17327903440368370-554: The 1600s, the concept of childhood began to emerge in Europe, however other historians like Nicholas Orme have challenged this view and argued that childhood has been seen as a separate stage since at least the medieval period. Adults saw children as separate beings, innocent and in need of protection and training by the adults around them. The English philosopher John Locke was particularly influential in defining this new attitude towards children, especially with regard to his theory of
8505-453: The 163 million dogs and cats kept in the United States consume about 20% of the amount of dietary energy that humans do and an estimated 33% of the animal-derived energy. They produce about 30% ± 13%, by mass, as much feces as Americans, and through their diet, constitute about 25–30% of the environmental impacts from animal production in terms of the use of land, water, fossil fuel, phosphate, and biocides. Dog and cat animal product consumption
8640-499: The 20th century, Philippe Ariès , a French historian specializing in medieval history , suggested that childhood was not a natural phenomenon, but a creation of society in his 1960 book Centuries of Childhood . In 1961 he published a study of paintings, gravestones, furniture, and school records, finding that before the 17th century, children were represented as mini-adults. In 1966, the American philosopher George Boas published
8775-715: The Cambrian explosion, possibly as early as 1 billion years ago. Early fossils that might represent animals appear for example in the 665-million-year-old rocks of the Trezona Formation of South Australia . These fossils are interpreted as most probably being early sponges . Trace fossils such as tracks and burrows found in the Tonian period (from 1 gya) may indicate the presence of triploblastic worm-like animals, roughly as large (about 5 mm wide) and complex as earthworms. However, similar tracks are produced by
8910-478: The Central African Republic having the highest average rate at 27.9%. Before contraception became widely available in the 20th century, women had little choice other than abstinence or having often many children. In fact, current population growth concerns have only become possible with drastically reduced child mortality and sustained fertility. In 2017 the global total fertility rate
9045-717: The Cnidaria) never grow larger than 20 μm , and one of the smallest species ( Myxobolus shekel ) is no more than 8.5 μm when fully grown. The following table lists estimated numbers of described extant species for the major animal phyla, along with their principal habitats (terrestrial, fresh water, and marine), and free-living or parasitic ways of life. Species estimates shown here are based on numbers described scientifically; much larger estimates have been calculated based on various means of prediction, and these can vary wildly. For instance, around 25,000–27,000 species of nematodes have been described, while published estimates of
9180-929: The Rights of the Child protects the fundamental rights of children. Play is essential to the cognitive, physical, social, and emotional well-being of children. It offers children opportunities for physical (running, jumping, climbing, etc.), intellectual (social skills, community norms, ethics and general knowledge) and emotional development (empathy, compassion, and friendships). Unstructured play encourages creativity and imagination. Playing and interacting with other children, as well as some adults, provides opportunities for friendships, social interactions, conflicts and resolutions. However, adults tend to (often mistakenly) assume that virtually all children's social activities can be understood as "play" and, furthermore, that children's play activities do not involve much skill or effort. It
9315-839: The United States. Keeping animals as pets may be detrimental to their health if certain requirements are not met. An important issue is inappropriate feeding, which may produce clinical effects. The consumption of chocolate or grapes by dogs, for example, may prove fatal. Certain species of houseplants can also prove toxic if consumed by pets. Examples include philodendrons and Easter lilies , which can cause severe kidney damage to cats, and poinsettias , begonia , and aloe vera , which are mildly toxic to dogs. For birds, chocolate can be deadly, and foods intended for human consumption, such as bread, crackers, and dairy items, can potentially cause health problems. Housepets, particularly dogs and cats in industrialized societies, are highly susceptible to obesity . Overweight pets have been shown to be at
9450-990: The ability to associate with the upper-class through ownership of their pets. The ability to care for a pet signified respectability and the capability to be self-sufficient. According to Harriet Ritvo, the identification of "elite animal and elite owner was not a confirmation of the owner's status but a way of redefining it." The popularity of dog and pet keeping generated animal fancy . Dog fanciers showed enthusiasm for owning pets, breeding dogs, and showing dogs in various shows. The first dog show took place on 28 June 1859 in Newcastle and focused mostly on sporting and hunting dogs. However, pet owners produced an eagerness to demonstrate their pets as well as have an outlet to compete. Thus, pet animals gradually were included within dog shows. The first large show, which would host one thousand entries, took place in Chelsea in 1863. The Kennel Club
9585-666: The age of 18 in sub-Saharan Africa, followed by South Asia at 30%. Lower levels were found in Latin America and Caribbean (25%), the Middle East and North Africa (18%), and Eastern Europe and Central Asia (11%), while rates in Western Europe and North America were minimal. Child marriage is more prevalent with girls, but also involves boys. A 2018 study in the journal Vulnerable Children and Youth Studies found that, worldwide, 4.5% of males are married before age 18, with
9720-435: The age of majority. In Singapore , for example, a child is legally defined as someone under the age of 14 under the "Children and Young Persons Act" whereas the age of majority is 21. In U.S. Immigration Law, a child refers to anyone who is under the age of 21. Some English definitions of the word child include the fetus (sometimes termed the unborn ). In many cultures, a child is considered an adult after undergoing
9855-402: The animals. A 1994 Canadian study found that the most common reasons for not owning a pet were lack of ability to care for the pet when traveling (34.6%), lack of time (28.6%), and lack of suitable housing (28.3%), with dislike of pets being less common (19.6%). Some scholars , ethicists , and animal rights organizations have raised concerns over keeping pets because of the lack of autonomy and
9990-547: The beginning of adulthood varies by country and by function, and even within a single nation-state or culture there may be different ages at which an individual is considered to be mature enough to be entrusted by society with certain tasks. During the European Renaissance , artistic depictions of children increased dramatically, which did not have much effect on the social attitude toward children, however. The French historian Philippe Ariès argued that during
10125-539: The book The Cult of Childhood . Since then, historians have increasingly researched childhood in past times. In 2006, Hugh Cunningham published the book Invention of Childhood , looking at British childhood from the year 1000, the Middle Ages , to what he refers to as the Post War Period of the 1950s, 1960s and 1970s. Childhood evolves and changes as lifestyles change and adult expectations alter. In
10260-637: The centrality of children found that Italy was more child-centric and the Netherlands less child-centric, with other countries, such as Austria, Great Britain, Ireland and West Germany falling in between. In 2013, child marriage rates of female children under the age of 18 reached 75% in Niger, 68% in Central African Republic and Chad, 66% in Bangladesh, and 47% in India . According to a 2019 UNICEF report on child marriage, 37% of females were married before
10395-546: The child becomes less dependent on parental assistance for basic needs, early childhood continues approximately until the age of 5 or 6. However, according to the National Association for the Education of Young Children , early childhood also includes infancy. At this stage children are learning through observing, experimenting and communicating with others. Adults supervise and support the development process of
10530-499: The child's imagination. Lewis Carroll 's fantasy Alice's Adventures in Wonderland , published in 1865 in England, was a landmark in the genre; regarded as the first "English masterpiece written for children", its publication opened the "First Golden Age" of children's literature. The latter half of the 19th century saw the introduction of compulsory state schooling of children across Europe, which decisively removed children from
10665-467: The child, which then will lead to the child's autonomy. Also during this stage, a strong emotional bond is created between the child and the care providers. The children also start preschool and kindergarten at this age: and hence their social lives. Middle childhood begins at around age 7, and ends at around age 9 or 10. Together, early and middle childhood are called formative years. In this middle period, children develop socially and mentally. They are at
10800-690: The cumulative culture created by young children and is sometimes referred to as their secret world . It is most common in children between the ages of seven and twelve. It is strongest in urban working class industrial districts where children are traditionally free to play out in the streets for long periods without supervision. It is invented and largely sustained by children themselves with little adult interference. Young children's street culture usually takes place on quiet backstreets and pavements, and along routes that venture out into local parks , playgrounds , scrub and wasteland, and to local shops. It often imposes imaginative status on certain sections of
10935-463: The dark sea floor consume organic matter produced through chemosynthesis (via oxidizing inorganic compounds such as hydrogen sulfide ) by archaea and bacteria . Animals evolved in the sea. Lineages of arthropods colonised land around the same time as land plants , probably between 510 and 471 million years ago during the Late Cambrian or Early Ordovician . Vertebrates such as
11070-499: The developmental period of infancy and puberty. Legally, the term child may refer to anyone below the age of majority or some other age limit. The United Nations Convention on the Rights of the Child defines child as, "A human being below the age of 18 years unless under the law applicable to the child, majority is attained earlier." This is ratified by 192 of 194 member countries. The term child may also refer to someone below another legally defined age limit unconnected to
11205-415: The divergence between high-minded romantic ideals of childhood and the reality of the growing magnitude of child exploitation in the workplace, became increasingly apparent. By the late 18th century, British children were specially employed in factories and mines and as chimney sweeps , often working long hours in dangerous jobs for low pay. As the century wore on, the contradiction between the conditions on
11340-454: The earliest times, and are frequently featured in mythology , religion , arts , literature , heraldry , politics , and sports . The word animal comes from the Latin noun animal of the same meaning, which is itself derived from Latin animalis 'having breath or soul'. The biological definition includes all members of the kingdom Animalia. In colloquial usage, the term animal
11475-449: The educational level of women, ranging from 5–8 children in women without education to less than 2 in women with 12 or more years of education. Emergencies and conflicts pose detrimental risks to the health , safety, and well-being of children. There are many different kinds of conflicts and emergencies, e.g. wars and natural disasters . As of 2010 approximately 13 million children are displaced by armed conflicts and violence around
11610-409: The evolved mechanisms responsible for human empathy and theory of mind to cover non-human animals which has not sufficiently impacted its evolutionary advantage in the long run. Animals in captivity , with the help of caretakers, have been considered to have owned pets. Examples of this include Koko the gorilla who had several pet cats, Tonda the orangutan and a pet cat and Tarra the elephant and
11745-518: The exploitation of children at the workplace The modern attitude to children emerged by the late 19th century; the Victorian middle and upper classes emphasized the role of the family and the sanctity of the child – an attitude that has remained dominant in Western societies ever since. The genre of children's literature took off, with a proliferation of humorous, child-oriented books attuned to
11880-570: The first hierarchical biological classification for animals in 1758 with his Systema Naturae , which Jean-Baptiste Lamarck expanded into 14 phyla by 1809. In 1874, Ernst Haeckel divided the animal kingdom into the multicellular Metazoa (now synonymous with Animalia) and the Protozoa , single-celled organisms no longer considered animals. In modern times, the biological classification of animals relies on advanced techniques, such as molecular phylogenetics , which are effective at demonstrating
12015-418: The flawed, human side of authority figures). Alongside that, they may begin to develop a sense of self - identity , and to have increased feelings of independence : 'may feel an individual, no longer "just one of the family."' Adolescence is usually determined to be between the onset of puberty and legal adulthood: mostly corresponding to the teenage years (13–19). However, puberty usually begins before
12150-412: The form of pet-keeping, was maladaptive , due to being biologically costly, or whether it was positively selected for. Two studies suggest that the human ability to domesticate and keep pets came from the same fundamental evolutionary trait and that this trait provided a material benefit in the form of domestication that was sufficiently adaptive to be positively selected for. A 2011 study suggests that
12285-448: The formation of complex structures possible. This may be calcified, forming structures such as shells , bones , and spicules . In contrast, the cells of other multicellular organisms (primarily algae, plants, and fungi ) are held in place by cell walls, and so develop by progressive growth. Animal cells uniquely possess the cell junctions called tight junctions , gap junctions , and desmosomes . With few exceptions—in particular,
12420-520: The fossil record, rather than showing that all these animals appeared simultaneously. That view is supported by the discovery of Auroralumina attenboroughii , the earliest known Ediacaran crown-group cnidarian (557–562 mya, some 20 million years before the Cambrian explosion) from Charnwood Forest , England. It is thought to be one of the earliest predators , catching small prey with its nematocysts as modern cnidarians do. Some palaeontologists have suggested that animals appeared much earlier than
12555-737: The giant single-celled protist Gromia sphaerica , so the Tonian trace fossils may not indicate early animal evolution. Around the same time, the layered mats of microorganisms called stromatolites decreased in diversity, perhaps due to grazing by newly evolved animals. Objects such as sediment-filled tubes that resemble trace fossils of the burrows of wormlike animals have been found in 1.2 gya rocks in North America, in 1.5 gya rocks in Australia and North America, and in 1.7 gya rocks in Australia. Their interpretation as having an animal origin
12690-838: The global level, Article 13 of the United Nations ' 1966 International Covenant on Economic, Social and Cultural Rights (ICESCR) recognizes the right of everyone to an education. Education is compulsory in most places up to a certain age, but attendance at school may not be, with alternative options such as home-schooling or e-learning being recognized as valid forms of education in certain jurisdictions. Children in some countries (especially in parts of Africa and Asia) are often kept out of school, or attend only for short periods. Data from UNICEF indicate that in 2011, 57 million children were out of school; and more than 20% of African children have never attended primary school or have left without completing primary education. According to
12825-464: The ground for poor children and the middle-class notion of childhood as a time of simplicity and innocence led to the first campaigns for the imposition of legal protection for children. British reformers attacked child labor from the 1830s onward, bolstered by the horrific descriptions of London street life by Charles Dickens . The campaign eventually led to the Factory Acts , which mitigated
12960-526: The human species. Anthropomorphism , or the projection of human feelings, thoughts and attributes on to animals, is a defining feature of human pet-keeping. The study identifies it as the same trait in evolution responsible for domestication and concern for animal welfare . It is estimated to have arisen at least 100,000 years before present (ybp) in Homo sapiens . It is debated whether this redirection of human nurturing behaviour towards non-human animals, in
13095-403: The ideas of John Locke and other 17th-century thinkers, Jean-Jaques Rousseau described childhood as a brief period of sanctuary before people encounter the perils and hardships of adulthood. Sir Joshua Reynolds ' extensive children portraiture demonstrated the new enlightened attitudes toward young children. His 1788 painting The Age of Innocence emphasizes the innocence and natural grace of
13230-771: The intention of safeguarding pets' and other animals' well-being. Since the year 2000, a small but increasing number of jurisdictions in North America have enacted laws redefining pet's owners as guardians . Intentions have been characterized as simply changing attitudes and perceptions but not legal consequences to working toward legal personhood for pets themselves. Some veterinarians and breeders have opposed these moves. The question of pets' legal status can arise with concern to purchase or adoption , custody , divorce , estate and inheritance , injury , damage , and veterinary malpractice . States, cities, and towns in Western countries commonly enact local ordinances to limit
13365-427: The issue would be costly or infeasible. Pets might have the ability to stimulate their caregivers, in particular the elderly, giving people someone to take care of, someone to exercise with, and someone to help them heal from a physically or psychologically troubled past. Animal company can also help people to preserve acceptable levels of happiness despite the presence of mood symptoms like anxiety or depression. Having
13500-441: The larvae feed on the hosts' living tissues, killing them in the process, but the adults primarily consume nectar from flowers. Other animals may have very specific feeding behaviours , such as hawksbill sea turtles which mainly eat sponges . Most animals rely on biomass and bioenergy produced by plants and phytoplanktons (collectively called producers ) through photosynthesis . Herbivores, as primary consumers , eat
13635-506: The legal definition of child generally refers to a minor , in this case as a person younger than the local age of majority (there are exceptions like, for example, the consume and purchase of alcoholic beverage even after said age of majority ), regardless of their physical, mental and sexual development as biological adults . Children generally have fewer rights and responsibilities than adults. They are generally classed as unable to make serious decisions. Child may also describe
13770-458: The loss of a dog, evidenced by inscriptions left on tombstones commemorating their loss. The surviving epitaphs dedicated to horses are more likely to reference a gratitude for the companionship that had come from war horses rather than race horses. The latter may have chiefly been commemorated as a way to further the owner's fame and glory. In Ancient Egypt , dogs and baboons were kept as pets and buried with their owners. Dogs were given names, which
13905-407: The modern era, many adults believe that children should not have any worries or work, as life should be happy and trouble-free. Childhood is seen as a mixture of simplicity, innocence, happiness, fun, imagination, and wonder. It is thought of as a time of playing, learning, socializing, exploring, and worrying in a world without much adult interference. A "loss of innocence" is a common concept, and
14040-753: The most extreme cold deserts of continental Antarctica . The blue whale ( Balaenoptera musculus ) is the largest animal that has ever lived, weighing up to 190 tonnes and measuring up to 33.6 metres (110 ft) long. The largest extant terrestrial animal is the African bush elephant ( Loxodonta africana ), weighing up to 12.25 tonnes and measuring up to 10.67 metres (35.0 ft) long. The largest terrestrial animals that ever lived were titanosaur sauropod dinosaurs such as Argentinosaurus , which may have weighed as much as 73 tonnes, and Supersaurus which may have reached 39 meters. Several animals are microscopic; some Myxozoa ( obligate parasites within
14175-545: The most popular pets are dogs and cats . Other animals commonly kept include rabbits ; ferrets ; pigs ; rodents such as gerbils , hamsters , chinchillas , rats , mice , and guinea pigs ; birds such as parrots , passerines , and fowls ; reptiles such as turtles , lizards , snakes , and iguanas ; aquatic pets such as fish , freshwater snails , and saltwater snails; amphibians such as frogs and salamanders ; and arthropod pets such as tarantulas and hermit crabs . Smaller pets include rodents , while
14310-568: The number or kind of pets a person may keep personally or for business purposes. Prohibited pets may be specific to certain breeds such as pit bulls or Rottweilers , they may apply to general categories of animals (such as livestock , exotic animals , wild animals , and canid or felid hybrids), or they may simply be based on the animal's size. Additional or different maintenance rules and regulations may also apply. Condominium associations and owners of rental properties also commonly limit or forbid tenants' keeping of pets. In Belgium and
14445-438: The objectification of non-human animals. In China, spending on domestic animals has grown from an estimated $ 3.12 billion in 2010 to $ 25 billion in 2018. The Chinese people own 51 million dogs and 41 million cats, with pet owners often preferring to source pet food internationally. There are a total of 755 million pets, increased from 389 million in 2013. According to a survey promoted by Italian family associations in 2009, it
14580-620: The oldest animal phylum and forming a sister clade to all other animals. Despite their morphological dissimilarity with all other animals, genetic evidence suggests sponges may be more closely related to other animals than the comb jellies are. Sponges lack the complex organization found in most other animal phyla; their cells are differentiated, but in most cases not organised into distinct tissues, unlike all other animals. They typically feed by drawing in water through pores, filtering out small particles of food. The comb jellies and Cnidaria are radially symmetric and have digestive chambers with
14715-525: The origins of animals to unicellular ancestors, providing the external phylogeny shown in the cladogram. Uncertainty of relationships is indicated with dashed lines. Holomycota (inc. fungi) [REDACTED] Ichthyosporea [REDACTED] Pluriformea [REDACTED] Filasterea [REDACTED] [REDACTED] [REDACTED] The most basal animals, the Porifera , Ctenophora , Cnidaria , and Placozoa , have body plans that lack bilateral symmetry . Their relationships are still disputed;
14850-687: The physical, mental and social well-being of children. Maintaining children's health implies offering them healthy foods, insuring they get enough sleep and exercise, and protecting their safety. Children in certain parts of the world often suffer from malnutrition , which is often associated with other conditions, such diarrhea, pneumonia and malaria. Child protection, according to UNICEF, refers to "preventing and responding to violence, exploitation and abuse against children – including commercial sexual exploitation , trafficking , child labour and harmful traditional practices, such as female genital mutilation /cutting and child marriage ". The Convention on
14985-538: The places and spaces in which children live. Nature Deficit Disorder, a term coined by Richard Louv in his 2005 book Last Child in the Woods , refers to the trend in the United States and Canada towards less time for outdoor play, resulting in a wide range of behavioral problems. With increasing use of cellphones, computers, video games and television, children have more reasons to stay inside rather than outdoors exploring. “The average American child spends 44 hours
15120-519: The plant material directly to digest and absorb the nutrients, while carnivores and other animals on higher trophic levels indirectly acquire the nutrients by eating the herbivores or other animals that have eaten the herbivores. Animals oxidize carbohydrates , lipids , proteins and other biomolecules, which allows the animal to grow and to sustain basal metabolism and fuel other biological processes such as locomotion . Some benthic animals living close to hydrothermal vents and cold seeps on
15255-637: The posing child and soon became a public favourite. The idea of childhood as a locus of divinity, purity, and innocence is further expounded upon in William Wordsworth 's "Ode: Intimations of Immortality from Recollections of Early Childhood", the imagery of which he "fashioned from a complex mix of pastoral aesthetics, pantheistic views of divinity, and an idea of spiritual purity based on an Edenic notion of pastoral innocence infused with Neoplatonic notions of reincarnation". This Romantic conception of childhood, historian Margaret Reeves suggests, has
15390-404: The practical functions that some pets provide, such as assisting hunting or removing pests , could have resulted in enough evolutionary advantage to allow for the persistence of this behaviour in humans and outweigh the economic burden held by pets kept as playthings for immediate emotional rewards. Two other studies suggest that the behaviour constitutes an error, side effect or misapplication of
15525-438: The property of their owners. Laws were created that punished offenders for their burglary. Pets and animals also had social and cultural implications throughout the nineteenth century. The categorization of dogs by their breeds reflected the hierarchical, social order of the Victorian era. The pedigree of a dog represented the high status and lineage of their owners and reinforced social stratification. Middle-class owners valued
15660-456: The recommendations of Wageningen University . Parliamentary debates about such a pet list date back to the 1980s, with continuous disagreements about which species should be included and how the law should be enforced. In January 2017, the white list was expanded to 123 species, while the black list that had been set up was expanded (with animals like the brown bear and two great kangaroo species) to contain 153 species unfit for petting, such as
15795-753: The sister group to all other animals could be the Porifera or the Ctenophora, both of which lack hox genes , which are important for body plan development . Hox genes are found in the Placozoa, Cnidaria, and Bilateria. 6,331 groups of genes common to all living animals have been identified; these may have arisen from a single common ancestor that lived 650 million years ago in the Precambrian . 25 of these are novel core gene groups, found only in animals; of those, 8 are for essential components of
15930-407: The smaller, motile gametes are spermatozoa and the larger, non-motile gametes are ova . These fuse to form zygotes , which develop via mitosis into a hollow sphere, called a blastula. In sponges, blastula larvae swim to a new location, attach to the seabed, and develop into a new sponge. In most other groups, the blastula undergoes more complicated rearrangement. It first invaginates to form
16065-541: The social lives of their owners and their connection to their community. There is some evidence that pets can facilitate social interaction. Assistant Professor of Sociology at the University of Colorado at Boulder, Leslie Irvine has focused her attention on pets of the homeless population. Her studies of pet ownership among the homeless found that many modify their life activities for fear of losing their pets. Pet ownership prompts them to act responsibly, with many making
16200-474: The sponges and placozoans —animal bodies are differentiated into tissues . These include muscles , which enable locomotion, and nerve tissues , which transmit signals and coordinate the body. Typically, there is also an internal digestive chamber with either one opening (in Ctenophora, Cnidaria, and flatworms) or two openings (in most bilaterians). Nearly all animals make use of some form of sexual reproduction. They produce haploid gametes by meiosis ;
16335-411: The structure at the base of the tree (dashed lines). Porifera [REDACTED] Ctenophora [REDACTED] Placozoa [REDACTED] Cnidaria [REDACTED] Xenacoelomorpha [REDACTED] Ambulacraria [REDACTED] Chordata [REDACTED] Ecdysozoa [REDACTED] Spiralia [REDACTED] An alternative phylogeny, from Kapli and colleagues (2021), proposes
16470-522: The subsequent Ediacaran period in what is known as the Avalon explosion . Earlier evidence of animals is still controversial; the sponge -like organism Otavia has been dated back to the Tonian period at the start of the Neoproterozoic , but its identity as an animal is heavily contested. Nearly all modern animal phyla became clearly established in the fossil record as marine species during
16605-406: The teenage years. Although biologically a child is a human being between the stages of birth and puberty , adolescents are legally considered children, as they tend to lack adult rights and are still required to attend compulsory schooling in many cultures, though this varies. The onset of adolescence brings about various physical, psychological and behavioral changes. The end of adolescence and
16740-559: The time would consider the offender's age when deliberating sentencing. Minimum employment age and marriage age also vary. The age limit of voluntary/involuntary military service is also disputed at the international level. Education, in the general sense, refers to the act or process of imparting or acquiring general knowledge, developing the powers of reasoning and judgment, and preparing intellectually for mature life. Formal education most often takes place through schooling . A right to education has been recognized by some governments. At
16875-467: The total number of nematode species include 10,000–20,000; 500,000; 10 million; and 100 million. Using patterns within the taxonomic hierarchy, the total number of animal species—including those not yet described—was calculated to be about 7.77 million in 2011. 3,000–6,500 4,000–25,000 Evidence of animals is found as long ago as the Cryogenian period. 24-Isopropylcholestane (24-ipc) has been found in rocks from roughly 650 million years ago; it
17010-404: The urban realm (local buildings, kerbs, street objects, etc.). Children designate specific areas that serve as informal meeting and relaxation places (see: Sobel, 2001). An urban area that looks faceless or neglected to an adult may have deep ' spirit of place ' meanings in to children. Since the advent of indoor distractions such as video games , and television , concerns have been expressed about
17145-405: The vitality – or even the survival – of children's street culture. The geographies of childhood involves how (adult) society perceives the idea of childhood, the many ways adult attitudes and behaviors affect children's lives, including the environment which surrounds children and its implications. The geographies of childhood is similar in some respects to children's geographies which examines
17280-468: The workplace into schools. The market economy of the 19th century enabled the concept of childhood as a time of fun, happiness, and imagination. Factory-made dolls and doll houses delighted the girls and organized sports and activities were played by the boys. The Boy Scouts was founded by Sir Robert Baden-Powell in 1908, which provided young boys with outdoor activities aiming at developing character, citizenship, and personal fitness qualities. In
17415-426: The world from younger children in many significant ways. Typically, theirs is a more realistic view of life than the intense, fantasy-oriented world of earliest childhood. Preadolescents have more mature, sensible, realistic thoughts and actions: 'the most "sensible" stage of development...the child is a much less emotional being now.' Preadolescents may well view human relationships differently (e.g. they may notice
17550-408: The world. Where violent conflicts are the norm, the lives of young children are significantly disrupted and their families have great difficulty in offering the sensitive and consistent care that young children need for their healthy development. Studies on the effect of emergencies and conflict on the physical and mental health of children between birth and 8 years old show that where the disaster
17685-419: Was "suggestive" of a significant benefit. A recent dissent comes from a 2017 RAND study, which found that at least in the case of children, having a pet per se failed to improve physical or mental health by a statistically significant amount; instead, the study found children who were already prone to being healthy were more likely to get pets in the first place. Conducting long-term randomized trials to settle
17820-533: Was created in 1873 to ensure fairness and organization within dog shows. The development of the Stud Book by the Kennel Club defined policies, presented a national registry system of purebred dogs, and essentially institutionalized dog shows. Pet ownership by animals in the wild, as an analogue to the human phenomenon, has not been observed and is likely non-existent in nature. One group of capuchin monkeys
17955-469: Was estimated to be 2.37 children per woman, adding about 80 million people to the world population per year. In order to measure the total number of children, scientists often prefer the completed cohort fertility at age 50 years (CCF50). Although the number of children is also influenced by cultural norms , religion , peer pressure and other social factors, the CCF50 appears to be most heavily dependent on
18090-428: Was observed appearing to care for a marmoset , a fellow New World monkey species; however, observations of chimpanzees apparently playing with small animals like hyraxes have ended with the chimpanzees killing the animals and tossing the corpses around. A 2010 study states that human relationships with animals have an exclusive human cognitive component and that pet-keeping is a fundamental and ancient attribute of
18225-473: Was shown to significantly reduce triglycerides, and thus heart disease risk, in the elderly. A study by the National Institute of Health found that people who owned dogs were less likely to die as a result of a heart attack than those who did not own one. There is some evidence that pets may have a therapeutic effect in dementia cases. Other studies have shown that for the elderly, good health may be
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