97-500: The Humane Slaughter Association (HSA) supports research, training, and development to improve the welfare of livestock during transport and slaughter . It provides technical information about handling and slaughter on its website, training for farmer staff and vets, advice to governments and industry, and funding of science and technology to make slaughter more humane . HSA is the sister charity to Universities Federation for Animal Welfare . The Council of Justice to Animals (CJA)
194-399: 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
291-982: A Research Training Scholarship for PhD research to Jessica Hopkins of the Scottish Agricultural College for exploration of humane mechanical methods to kill sick or injured chickens in emergency situations on farms, as an improvement over cervical dislocation , which is thought to not be completely humane. The research has been presented at several conferences. HSA offers grants "for essential research and other projects aimed at improving animal welfare during transport, in markets and at slaughter." Past grants have addressed livestock transport vehicle emergencies, monitoring atmosphere stunning of poultry, and electrical stunning on sea bass. A 2004 HSA workshop in Lochearnhead , Scotland, demonstrated an electric stunner for farmed trout. Electric stunning of farmed fish has since been widely adopted at least in
388-479: A chamber over the course of 5 minutes. The lack of oxygen induces unconsciousness without a rise in heart rate and with brain activity that resembles a sleep-like state before death. HSA offers training courses to farmers (large-scale, small-scale, and hobbyist), slaughter workers, and students. For example, here is a subset of the trainings HSA conducted during 2009-2010: HSA educational materials have won International Visual Communications Awards in 1995 and 2000 and
485-561: 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
582-404: A continuum from very good to very poor and studies of welfare will be most effective if a wide range of measures is used." John Webster criticized this definition for making "no attempt to say what constitutes good or bad welfare." Animal welfare often refers to a utilitarian attitude towards the well-being of nonhuman animals. It believes the animals can be exploited if the animal suffering and
679-658: A hollow sphere of cells, the blastula , during embryonic development . Animals form 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
776-512: A hypodermic needle according to good veterinary practice." It also includes modifying the genes of a protected animal if this causes the animal pain, suffering, distress, or lasting harm. The ASPA also considers other issues such as animal sources , housing conditions, identification methods, and the humane killing of animals. Those applying for a license must explain why such research cannot be done through non-animal methods. The project must also pass an ethical review panel which aims to decide if
873-663: A major slaughterhouse for this reason. HSA played a key role in passage of HSA was asked for its views on the UK Slaughterhouses Act 1958 and the Prevention of Cruelty and Hygiene Regulations. HSA was mentioned in the House of Lords debates over UK's Slaughter of Poultry Act 1967. HSA aims to encourage research and development of more humane livestock-slaughter methods with its Humane Slaughter Award, which recognizes "individuals or organisations, based anywhere in
970-678: A maximum of six months. In the UK, the welfare of research animals being used for "regulated procedures" was historically protected by the Animals (Scientific Procedures) Act 1986 (ASPA) which is administrated by the Home Office . The Act defines "regulated procedures" as animal experiments that could potentially cause "pain, suffering, distress or lasting harm" to "protected animals". Initially, "protected animals" encompassed all living vertebrates other than humans, but, in 1993, an amendment added
1067-1109: 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
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#17328011381891164-494: A research field to study "living things and their environment with respect to their welfare (defined as net happiness, or enjoyment minus suffering)." The European Commission 's activities in this area start with the recognition that animals are sentient beings. The general aim is to ensure that animals do not endure avoidable pain or suffering, and obliges the owner/keeper of animals to respect minimum welfare requirements. European Union legislation regarding farm animal welfare
1261-509: A single invertebrate species, the common octopus . Primates , cats , dogs , and horses have additional protection over other vertebrates under the Act. Revised legislation came into force in January 2013. This has been expanded to protect "...all living vertebrates, other than man, and any living cephalopod . Fish and amphibia are protected once they can feed independently and cephalopods at
1358-464: 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 ,
1455-602: Is a positive science." Dictionary definition – In the Saunders Comprehensive Veterinary Dictionary , animal welfare is defined as "the avoidance of abuse and exploitation of animals by humans by maintaining appropriate standards of accommodation, feeding and general care, the prevention and treatment of disease and the assurance of freedom from harassment, and unnecessary discomfort and pain." American Veterinary Medical Association (AVMA) has defined animal welfare as: "An animal
1552-433: 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
1649-687: Is an issue of importance as part of the social development of nations worldwide. The campaign to achieve the UDAW is being coordinated by World Animal Protection , with a core working group including Compassion in World Farming , the RSPCA, and the Humane Society International (the international branch of HSUS ). The 2019 UN Global Sustainable Development Report identified animal welfare as one of several key missing issues in
1746-486: Is coping with the conditions in which it lives. An animal is in a good state of welfare if (as indicated by scientific evidence) it is healthy, comfortable, well nourished, safe, able to express innate behaviour, and if it is not suffering from unpleasant states such as pain, fear, and distress. Good animal welfare requires disease prevention and veterinary treatment, appropriate shelter, management, nutrition, humane handling and humane slaughter/killing. Animal welfare refers to
1843-488: Is debate about which of these best indicate animal welfare. Respect for animal welfare is often based on the belief that nonhuman animals are sentient and that consideration should be given to their well-being or suffering , especially when they are under the care of humans. These concerns can include how animals are slaughtered for food, how they are used in scientific research , how they are kept (as pets, in zoos, farms, circuses, etc.), and how human activities affect
1940-463: 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
2037-461: Is in a good state of welfare if (as indicated by scientific evidence) it is healthy, comfortable, well nourished, safe, able to express innate behavior, and if it is not suffering from unpleasant states such as pain, fear, and distress." They have offered the following eight principles for developing and evaluating animal welfare policies. Terrestrial Animal Health Code of World Organisation for Animal Health defines animal welfare as "how an animal
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#17328011381892134-450: 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 :
2231-808: 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
2328-422: 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
2425-591: Is regularly re-drafted according to science-based evidence and cultural views. For example, in 2009, legislation was passed which aimed to reduce animal suffering during slaughter and on 1 January 2012, the European Union Council Directive 1999/74/EC came into act, which means that conventional battery cages for laying hens are now banned across the Union. The Animal Welfare Act 2006 makes owners and keepers responsible for ensuring that
2522-518: Is sometimes defined by a list of positive conditions which should be provided to the animal. This approach is taken by the Five Freedoms and the three principles of professor John Webster. The Five Freedoms are: John Webster defines animal welfare by advocating three positive conditions: Living a natural life, being fit and healthy, and being happy. High production – In the past, many have seen farm animal welfare chiefly in terms of whether
2619-417: Is that consciousness exists in nonhuman animals; however, some still maintain that consciousness is a philosophical question that may never be scientifically resolved. Remarkably, a new study has managed to overcome some of the difficulties in testing this question empirically and devised a unique way to dissociate conscious from nonconscious perception in animals. In this study conducted in rhesus monkeys,
2716-547: 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
2813-622: 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
2910-619: 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
3007-669: The Five Freedoms . In the UK, the " Animal Welfare Act 2006 " consolidated many different forms of animal welfare legislation. A number of animal welfare organisations are campaigning to achieve a Universal Declaration on Animal Welfare (UDAW) at the United Nations. In principle, the Universal Declaration would call on the United Nations to recognise animals as sentient beings, capable of experiencing pain and suffering, and to recognise that animal welfare
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3104-690: The National Institutes of Health Office of Laboratory Animal Welfare, researchers must try to minimize distress in animals whenever possible: "Animals used in research and testing may experience pain from induced diseases, procedures, and toxicity. The Public Health Service (PHS) Policy and Animal Welfare Regulations (AWRs) state that procedures that cause more than momentary or slight pain or distress should be performed with appropriate sedation, analgesia, or anesthesia. However, research and testing studies sometimes involve pain that cannot be relieved with such agents because they would interfere with
3201-529: The RSPCA . The society used members' donations to employ a growing network of inspectors, whose job was to identify abusers, gather evidence, and report them to the authorities. In 1837, the German minister Albert Knapp founded the first German animal welfare society. One of the first national laws to protect animals was the UK " Cruelty to Animals Act 1835 " followed by the " Protection of Animals Act 1911 ". In
3298-485: 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
3395-665: 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
3492-473: 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
3589-497: 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
3686-410: The mulesing of sheep and predation of stock by wild animals. Biosecurity is also a risk with free range farming, as it allows for more contact between livestock and wild animal populations, which may carry zoonoses . Farmed animals are artificially selected for production parameters which sometimes impinge on the animals' welfare. For example, broiler chickens are bred to be very large to produce
3783-500: 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
3880-513: The " Cruel Treatment of Cattle Act 1822 " through Parliament offering protection from cruelty to cattle, horses, and sheep, an animal welfare movement has been active in England. Martin was among the founders of the world's first animal welfare organization, the Society for the Prevention of Cruelty to Animals , or SPCA, in 1824. In 1840, Queen Victoria gave the society her blessing, and it became
3977-460: The 2030 Agenda for Sustainable Development. Animal welfare science is an emerging field that seeks to answer questions raised by the keeping and use of animals, such as whether hens are frustrated when confined in cages, whether the psychological well-being of animals in laboratories can be maintained, and whether zoo animals are stressed by the transport required for international conservation. Ireland leads research into farm animal welfare with
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4074-587: The Bruite Creatures" Liberty 92 and 93 in the " Massachusetts Body of Liberties " of 1641. In 1776, English clergyman Humphrey Primatt authored A Dissertation on the Duty of Mercy and Sin of Cruelty to Brute Animals , one of the first books published in support of animal welfare. Marc Bekoff said that "Primatt was largely responsible for bringing animal welfare to the attention of the general public." Since 1822, when Irish MP Richard Martin brought
4171-715: 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
4268-717: 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
4365-788: The Humane Slaughter Association, which is most often called "the HSA". On 1 April 2016 the Humane Slaughter Association became a charitable incorporated organization and the Council of Justice for Animals was dropped from the name. In the early 1920s, HSA introduced and demonstrated a mechanical stunner, which led to the adoption of humane stunning "by 28 London boroughs and later by 494 other local authorities." HSA helped improve water, shelter, and handling conditions at animal markets. It lobbied for transporting cattle by train instead of on foot, and in 1941, rail lines were built to
4462-842: The Meat Industry Awards Training Initiative of the Year, Poultry Welfare in 2006. HSA also provides advice to meat producers, governments, and academics. At the request of a producer or retailer, it performs inspections of slaughterhouses and livestock markets to assess animal welfare and suggest improvements. Animal welfare Animal welfare is the well-being of non-human animals . Formal standards of animal welfare vary between contexts, but are debated mostly by animal welfare groups, legislators, and academics. Animal welfare science uses measures such as longevity , disease , immunosuppression , behavior , physiology , and reproduction , although there
4559-460: The UK alone, up to 20 million broilers each year die from the stress of catching and transporting before reaching the slaughterhouse. Animal welfare violations have been observed more in intensively bred chicken, pig and cattle species, respectively, and studies and laws have been enacted in this regard. However, animal welfare in semi-intensive species such as sheep and goats is nowadays being scrutinised and gaining importance. Another concern about
4656-467: The UK. In 2011, to celebrate its centennial year, HSA organized the symposium "Recent Advances in the Welfare of Livestock at Slaughter", which was attended by 250 people from around the world. The event featured over a dozen presentations, including one by Temple Grandin . In 2013, HSA convened a workshop on Low Atmospheric Pressure Stunning (LAPS), a proposal to kill chickens by withdrawing air from
4753-878: The US are also protected under the Animal Welfare Act . The United States Department of Agriculture Animal and Plant Health Inspection Service (APHIS) enforces the Animal Welfare Act. APHIS inspects animal research facilities regularly and reports are published online. According to the U.S. Department of Agriculture (USDA), the total number of animals used in the U.S. in 2005 was almost 1.2 million, but this does not include rats, mice, and birds which are not covered by welfare legislation but make up approximately 90% of research animals. There are many different approaches to describing and defining animal welfare. Positive conditions – Providing good animal welfare
4850-473: The US it was many years until there was a national law to protect animals—the " Animal Welfare Act of 1966 "—although there were a number of states that passed anti-cruelty laws between 1828 and 1898. In India, animals are protected by the " Prevention of Cruelty to Animals Act, 1960 ". Significant progress in animal welfare did not take place until the late 20th century. In 1965, the UK government commissioned an investigation—led by professor Roger Brambell—into
4947-523: The US, every institution that uses vertebrate animals for federally funded laboratory research must have an Institutional Animal Care and Use Committee (IACUC). Each local IACUC reviews research protocols and conducts evaluations of the institution's animal care and use which includes the results of inspections of facilities that are required by law. The IACUC committee must assess the steps taken to "enhance animal well-being" before research can take place. This includes research on farm animals. According to
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#17328011381895044-407: The animal is producing well. The argument is that an animal in poor welfare would not be producing well, however, many farmed animals will remain highly productive despite being in conditions where good welfare is almost certainly compromised, e.g., layer hens in battery cages . Emotion in animals – Others in the field, such as professor Ian Duncan and professor Marian Dawkins , focus more on
5141-800: The captives afterward for signs of infection from the procedure. Research on wild cetaceans leaves them free to roam and make sounds in their natural habitat, eat live fish, face predators and injury, and form social groups voluntarily. However, boat engines of researchers, whale watchers and others add substantial noise to their natural environment, reducing their ability to echolocate and communicate. Electric engines are far quieter, but are not widely used for either research or whale watching, even for maintaining position, which does not require much power. Vancouver Port offers discounts for ships with quiet propeller and hull designs. Other areas have reduced speeds. Boat engines also have unshielded propellers, which cause serious injuries to cetaceans who come close to
5238-583: The cetaceans from a distance with dart guns. A cetacean was killed by a fungal infection after being darted, due to either an incompletely sterilized dart or an infection from the ocean entering the wound caused by the dart. Researchers on wild cetaceans have not yet been able to use drones to capture noninvasive breath samples. Other harms to wild cetaceans include commercial whaling , aboriginal whaling , drift netting , ship collisions , water pollution , noise from sonar and reflection seismology , predators , loss of prey , and disease . Efforts to enhance
5335-419: The costs of use is less than the benefits to humans. This attitude is also known simply as welfarism . 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
5432-463: 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
5529-761: The doctrine of non-violence . In the 13th century CE, Genghis Khan protected wildlife in Mongolia during the breeding season (March to October). Early legislation in the Western world on behalf of animals includes the Ireland Parliament (Thomas Wentworth) " An Act against Plowing by the Tayle, and pulling the Wooll off living Sheep ", 1635, and the Massachusetts Colony ( Nathaniel Ward ) "Off
5626-454: 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
5723-551: The end of the procedure, or if appropriate, during the procedure." The National Research Council's Guide for the Care and Use of Laboratory Animals also serves as a guide to improve welfare for animals used in research in the US. The Federation of Animal Science Societies' Guide for the Care and Use of Agricultural Animals in Research and Teaching is a resource addressing welfare concerns in farm animal research. Laboratory animals in
5820-481: The feelings of the animal. This approach indicates the belief that animals should be considered as sentient beings. Duncan wrote, "Animal welfare is to do with the feelings experienced by animals: the absence of strong negative feelings, usually called suffering, and (probably) the presence of positive feelings, usually called pleasure. In any assessment of welfare, it is these feelings that should be assessed." Dawkins wrote, "Let us not mince words: Animal welfare involves
5917-570: 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
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#17328011381896014-659: The first time, minimum standards of care. Additional provisions, called the Humane Euthanasia Act, were added in 1990, and then further expanded and strengthened with the Animal Protection Act of 2000. In 2002, voters passed (by a margin of 55% for and 45% against) Amendment 10 to the Florida Constitution banning the confinement of pregnant pigs in gestation crates. In 2006, Arizona voters passed Proposition 204 with 62% support;
6111-448: 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,
6208-520: 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
6305-737: 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
6402-434: The greatest quantity of meat per animal. Broilers bred for fast growth have a high incidence of leg deformities because the large breast muscles cause distortions of the developing legs and pelvis, and the birds cannot support their increased body weight. As a consequence, they frequently become lame or suffer from broken legs. The increased body weight also puts a strain on their hearts and lungs, and ascites often develop. In
6499-441: 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
6596-569: The legislation prohibits the confinement of calves in veal crates and breeding sows in gestation crates. In 2007, the Governor of Oregon signed legislation prohibiting the confinement of pigs in gestation crates and in 2008, the Governor of Colorado signed legislation that phased out both gestation crates and veal crates. Also during 2008, California passed Proposition 2 , known as the "Prevention of Farm Animal Cruelty Act", which orders new space requirements for farm animals starting in 2015. In
6693-410: The life of wild cetaceans, besides reducing those harms, include offering human music. Canadian rules do not forbid playing quiet music, though they forbid "noise that may resemble whale songs or calls, underwater". In addition to cetaceans, the welfare of other wild animals has also been studied, though to a lesser extent than that of animals in farms. Research in wild animal welfare has two focuses:
6790-753: 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
6887-620: 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
6984-525: 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;
7081-423: The perception of better animal welfare facilitates continued and increased exploitation of animals. Some authorities therefore treat animal welfare and animal rights as two opposing positions. Others see animal welfare gains as incremental steps towards animal rights. The predominant view of modern neuroscientists , notwithstanding philosophical problems with the definition of consciousness even in humans,
7178-519: 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
7275-425: The point when they hatch. Embryonic and foetal forms of mammals, birds and reptiles are protected during the last third of their gestation or incubation period." The definition of regulated procedures was also expanded: "A procedure is regulated if it is carried out on a protected animal and may cause that animal a level of pain, suffering, distress or lasting harm equivalent to, or higher than, that caused by inserting
7372-689: The potential benefits outweigh any suffering for the animals involved. In the United States, a federal law called the Humane Slaughter Act was designed to decrease suffering of livestock during slaughter. The Georgia Animal Protection Act of 1986 was a state law enacted in response to the inhumane treatment of companion animals by a pet store chain in Atlanta . The Act provided for the licensing and regulation of pet shops, stables, kennels, and animal shelters, and established, for
7469-1163: The production of goat and cattle milk, raising the same concerns. A 2023 report by the Animal Welfare Institute found that animal welfare claims by companies selling meat and poultry products lack adequate substantiation in roughly 85% of analyzed cases. Captive cetaceans are kept for display, research and naval operations. To enhance their welfare, humans feed them fish that are dead but are disease-free, protect them from predators and injury, monitor their health, and provide activities for behavioral enrichment . Some are kept in lagoons with natural soil and vegetated sides. Most are in concrete tanks which are easy to clean but echo their natural sounds back to them. They cannot develop their own social groups, and related cetaceans are typically separated for display and breeding. Military dolphins used in naval operations swim free during operations and training and return to pens otherwise. Captive cetaceans are trained to present themselves for blood samples, health exams, and noninvasive breath samples above their blow holes. Staff can monitor
7566-581: The propeller. The US Coast Guard has proposed rules on propeller guards to protect human swimmers, but has not adopted any rules. The US Navy uses propeller guards to protect manatees in Georgia. Ducted propellers provide more efficient drive at speeds up to 10 knots, and protect animals beneath and beside them, but need grilles to prevent injuries to animals drawn into the duct. Attaching satellite trackers and obtaining biopsies to measure pollution loads and DNA involve either capture and release, or shooting
7663-579: The proponents of these views have advocated carrying out conservation efforts in ways that respect the welfare of wild animals, within the framework of the disciplines of compassionate conservation and conservation welfare , while others have argued in favor of improving the welfare of wild animals for the sake of the animals, regardless of whether there are any conservation issues involved at all. The welfare economist Yew-Kwang Ng , in his 1995 "Towards welfare biology: Evolutionary economics of animal consciousness and suffering", proposed welfare biology as
7760-746: The recently published Research Report on Farm Animal Welfare Archived 8 May 2019 at the Wayback Machine . A major concern for the welfare of farmed animals is factory farming in which large numbers of animals are reared in confinement at high stocking densities. Issues include the limited opportunities for natural behaviors, for example, in battery cages , veal and gestation crates , instead producing abnormal behaviors such as tail-biting, cannibalism, and feather pecking , and routine invasive procedures such as beak trimming , castration , and ear notching .More extensive methods of farming, e.g. free range , can also raise welfare concerns such as
7857-570: The researchers built experiments predicting completely opposite behavioral outcomes to consciously vs. non-consciously perceived stimuli. Strikingly, the monkeys' behaviors displayed these exact opposite signatures, just like aware and unaware humans tested in the study. Animal protection laws were enacted as early as the 1st millennium BCE in India . Several Indian kings built hospitals for animals, and emperor Ashoka (304–232 BCE) issued orders against hunting and animal slaughter, in line with ahimsa ,
7954-522: The scientific objectives of the study. Accordingly, federal regulations require that IACUCs determine that discomfort to animals will be limited to that which is unavoidable for the conduct of scientifically valuable research, and that unrelieved pain and distress will only continue for the duration necessary to accomplish the scientific objectives. The PHS Policy and AWRs further state that animals that would otherwise suffer severe or chronic pain and distress that cannot be relieved should be painlessly killed at
8051-753: 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
8148-407: 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
8245-474: 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 ;
8342-476: The state of the animal; the treatment that an animal receives is covered by other terms such as animal care, animal husbandry, and humane treatment." Coping – Professor Donald Broom defines the welfare of an animal as "Its state as regards its attempts to cope with its environment. This state includes how much it is having to do to cope, the extent to which it is succeeding in or failing to cope, and its associated feelings." He states that "welfare will vary over
8439-411: 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
8536-403: The subjective feelings of animals." Welfare biology – Yew-Kwang Ng defines animal welfare in terms of welfare economics : "Welfare biology is the study of living things and their environment with respect to their welfare (defined as net happiness, or enjoyment minus suffering ). Despite difficulties of ascertaining and measuring welfare and relevancy to normative issues, welfare biology
8633-522: 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
8730-467: 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
8827-465: The welfare and survival of wild species. There are two forms of criticism of the concept of animal welfare, coming from diametrically opposite positions. One view, held by some thinkers in history, holds that humans have no duties of any kind to animals. The other view is based on the animal rights position that animals should not be regarded as property and any use of animals by humans is unacceptable. Accordingly, some animal rights proponents argue that
8924-454: The welfare needs of their animals are met. These include the need: for a suitable environment (place to live), for a suitable diet, to exhibit normal behavior patterns, to be housed with, or apart from, other animals (if applicable), and to be protected from pain, injury, suffering and disease. Anyone who is cruel to an animal, or does not provide for its welfare needs, may be banned from owning animals, fined up to £20,000 and/or sent to prison for
9021-496: The welfare of farmed animals is the method of slaughter , especially ritual slaughter . While the killing of animals need not necessarily involve suffering, the general public considers that killing an animal reduces its welfare. This leads to further concerns about premature slaughtering such as chick culling by the laying hen industry , in which males are slaughtered immediately after hatching because they are superfluous; this policy occurs in other farmed animal industries such as
9118-761: The welfare of intensively farmed animals, partly in response to concerns raised in Ruth Harrison 's 1964 book, Animal Machines . On the basis of Brambell's report, the UK government set up the Farm Animal Welfare Advisory Committee in 1967, which became the Farm Animal Welfare Council in 1979. The committee's first guidelines recommended that animals require the freedom to "stand up, lie down, turn around, groom themselves and stretch their limbs." The guidelines have since been elaborated upon to become known as
9215-414: The welfare of wild animals kept in captivity and the welfare of animals living in the wild. The former has addressed the situation of animals kept both for human use, as in zoos or circuses , or in rehabilitation centers. The latter has examined how the welfare of non-domesticated animals living in wild or urban areas are affected by humans or natural factors causing wild animal suffering . Some of
9312-572: The world, whose work has resulted in significant advances in the humane slaughter of farmed livestock." HSA has given a total of 48 Dorothy Sidley Scholarships of £2,000 each "to enable students or trainees in the industry to carry out a project which is clearly aimed at improving the welfare of food animals in markets, during transport or at slaughter." Research supported has included the welfare of sheep while transported at sea, handling methods for poultry, rejection of carcases in religious slaughter, and captive-bolt stunning of alpacas. In 2011, HSA gave
9409-483: Was founded at a meeting held on 17 January 1911 to improve humane methods for the slaughter of livestock and address the killing of unwanted pets. The Duchess of Portland was elected President, physician Charles Reinhardt was Chairman and novelist Thomas Hardy was a member of the committee. In 1928, CJA merged with the Humane Slaughter of Animals Association to become the Council of Justice for Animals and
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