How Do Deep Sea Animals Get Oxygen
Animals Temporal range: Cryogenian – present, | |
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Scientific classification | |
Domain: | Eukaryota |
(unranked): | Amorphea |
(unranked): | Obazoa |
(unranked): | Opisthokonta |
(unranked): | Holozoa |
(unranked): | Filozoa |
Kingdom: | Animalia Linnaeus, 1758 |
Major divisions | |
meet text | |
Synonyms | |
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Animals (also chosen Metazoa) are multicellular, eukaryotic organisms in the biological kingdom Animalia. With few exceptions, animals eat organic textile, breathe oxygen, are able to move, can reproduce sexually, and go through an ontogenetic stage in which their body consists of a hollow sphere of cells, the blastula, during embryonic development. Over ane.five meg living animal species have been described—of which around 1 meg are insects—simply it has been estimated there are over vii million fauna species in total. Animals range in length from 8.5 micrometres (0.00033 in) to 33.6 metres (110 ft). They have complex interactions with each other and their environments, forming intricate food webs. The scientific study of animals is known every bit zoology.
About living animal species are in Bilateria, a clade whose members have a bilaterally symmetric body plan. The Bilateria include the protostomes, containing animals such equally nematodes, arthropods, flatworms, annelids and molluscs, and the deuterostomes, containing the echinoderms and the chordates, the latter including the vertebrates. Life forms interpreted as early on animals were nowadays in the Ediacaran biota of the late Precambrian. Many mod animal phyla became clearly established in the fossil record every bit marine species during the Cambrian explosion, which began effectually 539 meg years agone. 6,331 groups of genes common to all living animals have been identified; these may take arisen from a unmarried mutual ancestor that lived 650 one thousand thousand years ago.
Historically, Aristotle divided animals into those with blood and those without. Carl Linnaeus created the first hierarchical biological nomenclature for animals in 1758 with his Systema Naturae, which Jean-Baptiste Lamarck expanded into 14 phyla past 1809. In 1874, Ernst Haeckel divided the animal kingdom into the multicellular Metazoa (now synonymous for Animalia) and the Protozoa, single-celled organisms no longer considered animals. In modern times, the biological classification of animals relies on avant-garde techniques, such as molecular phylogenetics, which are effective at demonstrating the evolutionary relationships between taxa.
Humans make use of many brute species, such as for food (including meat, milk, and eggs), for materials (such as leather and wool), equally pets, and as working animals including for ship. Dogs have been used in hunting, every bit accept birds of casualty, while many terrestrial and aquatic animals were hunted for sports. Nonhuman animals have appeared in art from the earliest times and are featured in mythology and religion.
Etymology
The word fauna comes from the Latin animalis , pregnant 'having breath', 'having soul' or 'living existence'.[1] The biological definition includes all members of the kingdom Animalia.[2] In vernacular usage, the term creature is oftentimes used to refer but to nonhuman animals.[three] [four] [five] [6]
Characteristics
Animals have several characteristics that set them apart from other living things. Animals are eukaryotic and multicellular.[seven] [viii] Unlike plants and algae, which produce their own nutrients,[nine] animals are heterotrophic,[8] [10] feeding on organic textile and digesting it internally.[11] With very few exceptions, (instance; Henneguya zschokkei [12]) animals respire aerobically.[xiii] All animals are motile[xiv] (able to spontaneously movement their bodies) during at least part of their life cycle, merely some animals, such equally sponges, corals, mussels, and barnacles, later become sessile. The blastula is a stage in embryonic development that is unique to animals,[15] (though it has been lost in some) assuasive cells to be differentiated into specialised tissues and organs.
Construction
All animals are composed of cells, surrounded by a feature extracellular matrix equanimous of collagen and elastic glycoproteins.[16] During evolution, the brute extracellular matrix forms a relatively flexible framework upon which cells tin move nearly and be reorganised, making the formation of complex structures possible. This may exist calcified, forming structures such as shells, basic, and spicules.[17] In contrast, the cells of other multicellular organisms (primarily algae, plants, and fungi) are held in place past cell walls, and so develop by progressive growth.[eighteen] Animal cells uniquely possess the jail cell junctions called tight junctions, gap junctions, and desmosomes.[19]
With few exceptions—in particular, the sponges and placozoans—animal bodies are differentiated into tissues.[20] These include muscles, which enable locomotion, and nerve tissues, which transmit signals and coordinate the body. Typically, at that place is too an internal digestive bedchamber with either 1 opening (in Ctenophora, Cnidaria, and flatworms) or two openings (in most bilaterians).[21]
Reproduction and development
Nearly all animals make utilize of some form of sexual reproduction.[22] They produce haploid gametes past meiosis; the smaller, motile gametes are spermatozoa and the larger, non-motile gametes are ova.[23] These fuse to form zygotes,[24] which develop via mitosis into a hollow sphere, called a blastula. In sponges, blastula larvae swim to a new location, adhere to the seabed, and develop into a new sponge.[25] In most other groups, the blastula undergoes more complicated rearrangement.[26] It first invaginates to class a gastrula with a digestive chamber and 2 separate germ layers, an external ectoderm and an internal endoderm.[27] In near cases, a third germ layer, the mesoderm, likewise develops between them.[28] These germ layers then differentiate to form tissues and organs.[29]
Repeated instances of mating with a close relative during sexual reproduction by and large leads to inbreeding low within a population due to the increased prevalence of harmful recessive traits.[xxx] [31] Animals have evolved numerous mechanisms for avoiding shut inbreeding.[32]
Some animals are capable of asexual reproduction, which often results in a genetic clone of the parent. This may accept place through fragmentation; budding, such as in Hydra and other cnidarians; or parthenogenesis, where fertile eggs are produced without mating, such as in aphids.[33] [34]
Ecology
Animals are categorised into ecological groups depending on how they obtain or swallow organic fabric, including carnivores, herbivores, omnivores, detritivores,[35] and parasites.[36] Interactions between animals form complex food webs. In cannibal or omnivorous species, predation is a consumer–resources interaction where a predator feeds on another organism (called its casualty).[37] Selective pressures imposed on one another lead to an evolutionary arms race between predator and prey, resulting in various anti-predator adaptations.[38] [39] Almost all multicellular predators are animals.[xl] Some consumers apply multiple methods; for example, in parasitoid wasps, the larvae feed on the hosts' living tissues, killing them in the process,[41] only the adults primarily swallow nectar from flowers.[42] Other animals may accept very specific feeding behaviours, such as hawksbill sea turtles primarily eating sponges.[43]
Most animals rely on the biomass and free energy produced past plants through photosynthesis. Herbivores eat plant textile straight, while carnivores, and other animals on higher trophic levels typically acquire it indirectly by eating other animals. Animals oxidize carbohydrates, lipids, proteins, and other biomolecules, which allows the animal to grow and to sustain biological processes such as locomotion.[44] [45] [46] Animals living shut to hydrothermal vents and cold seeps on the nighttime ocean floor eat organic matter of archaea and leaner produced in these locations through chemosynthesis (by oxidizing inorganic compounds, such as hydrogen sulfide).[47]
Animals originally evolved in the body of water. Lineages of arthropods colonised land around the aforementioned fourth dimension as country plants, probably between 510 and 471 1000000 years agone during the Late Cambrian or Early on Ordovician.[48] Vertebrates such equally the lobe-finned fish Tiktaalik started to movement on to state in the belatedly Devonian, about 375 meg years agone.[49] [l] Animals occupy virtually all of earth's habitats and microhabitats, including salt water, hydrothermal vents, fresh water, hot springs, swamps, forests, pastures, deserts, air, and the interiors of animals, plants, fungi and rocks.[51] Animals are withal non especially heat tolerant; very few of them can survive at abiding temperatures above 50 °C (122 °F).[52] Only very few species of animals (mostly nematodes) inhabit the virtually extreme cold deserts of continental Antarctica.[53]
Diversity
Size
The blue whale (Balaenoptera musculus) is the largest brute that has e'er lived, weighing up to 190 tonnes and measuring upwards to 33.6 metres (110 ft) long.[54] [55] [56] The largest extant terrestrial animal is the African bush elephant (Loxodonta africana), weighing upwards to 12.25 tonnes[54] and measuring up to ten.67 metres (35.0 ft) long.[54] The largest terrestrial animals that ever lived were titanosaur sauropod dinosaurs such equally Argentinosaurus, which may accept weighed as much as 73 tonnes.[57] Several animals are microscopic; some Myxozoa (obligate parasites within the Cnidaria) never grow larger than 20 µm,[58] and one of the smallest species (Myxobolus shekel) is no more than 8.5 µm when fully grown.[59]
Numbers and habitats
The post-obit tabular array lists estimated numbers of described extant species for the animal groups with the largest numbers of species,[sixty] along with their principal habitats (terrestrial, fresh h2o,[61] and marine),[62] and free-living or parasitic ways of life.[63] Species estimates shown here are based on numbers described scientifically; much larger estimates accept been calculated based on various means of prediction, and these can vary wildly. For instance, around 25,000–27,000 species of nematodes take been described, while published estimates of the total number of nematode species include x,000–20,000; 500,000; 10 million; and 100 million.[64] 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.[65] [66] [a]
Phylum | Instance | No. of Species | Land | Ocean | Fresh water | Free- living | Parasitic |
---|---|---|---|---|---|---|---|
Arthropods | 1,257,000[60] | one,000,000 (insects)[68] | >xl,000 (Malac- ostraca)[69] | 94,000[61] | Yeah[62] | >45,000[b] [63] | |
Molluscs | 85,000[threescore] 107,000[70] | 35,000[lxx] | 60,000[70] | 5,000[61] 12,000[seventy] | Aye[62] | >five,600[63] | |
Chordates | >70,000[lx] [71] | 23,000[72] | thirteen,000[72] | 18,000[61] 9,000[72] | Aye | forty (catfish)[73] [63] | |
Platyhelminthes | 29,500[60] | Yes[74] | Aye[62] | 1,300[61] | Yeah[62] 3,000–6,500[75] | >40,000[63] four,000–25,000[75] | |
Nematodes | 25,000[threescore] | Yeah (soil)[62] | 4,000[64] | 2,000[61] | eleven,000[64] | 14,000[64] | |
Annelids | 17,000[60] | Yep (soil)[62] | Yes[62] | i,750[61] | Yep | 400[63] | |
Cnidaria | xvi,000[60] | Yep[62] | Yeah (few)[62] | Yep[62] | >1,350 (Myxozoa)[63] | ||
Sponges | x,800[60] | Yes[62] | 200-300[61] | Yeah | Aye[76] | ||
Echinoderms | seven,500[lx] | seven,500[threescore] | Yes[62] | ||||
Bryozoa | half-dozen,000[threescore] | Yes[62] | 60–eighty[61] | Yes | |||
Rotifers | ii,000[lx] | >400[77] | ii,000[61] | Yes | |||
Full number of described extant species as of 2013[update]: 1,525,728[lx] |
Evolutionary origin
The first fossils that might represent animals appear in the 665-million-year-old rocks of the Trezona Formation of South Commonwealth of australia. These fossils are interpreted as almost probably being early sponges.[79]
Animals are institute as long ago every bit the Ediacaran biota, towards the end of the Precambrian, and perhaps somewhat earlier. Information technology had long been doubted whether these life-forms included animals,[fourscore] [81] [82] merely the discovery of the animal lipid cholesterol in fossils of Dickinsonia establishes their nature.[78] Animals are thought to have originated under low-oxygen weather, suggesting that they were capable of living entirely past anaerobic respiration, but as they became specialized for aerobic metabolism they became fully dependent on oxygen in their environments.[83]
Many fauna phyla first appear in the fossil record during the Cambrian explosion, starting most 539 million years ago, in beds such as the Burgess shale.[84] 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 notwithstanding exist an artefact of the fossil record, rather than showing that all these animals appeared simultaneously.[85] [86] [87] [88]
Some palaeontologists have suggested that animals appeared much earlier than the Cambrian explosion, possibly as early equally 1 billion years agone.[89] Trace fossils such every bit tracks and burrows establish in the Tonian catamenia may indicate the presence of triploblastic worm-like animals, roughly as large (most 5 mm wide) and complex every bit earthworms.[90] However, similar tracks are produced today past the giant single-celled protist Gromia sphaerica, so the Tonian trace fossils may not indicate early brute evolution.[91] [92] Effectually the same time, the layered mats of microorganisms called stromatolites decreased in diversity, perhaps due to grazing by newly evolved animals.[93]
Phylogeny
Animals are monophyletic, meaning they are derived from a common antecedent. Animals are sister to the Choanoflagellata, with which they form the Choanozoa.[94] The most basal animals, the Porifera, Ctenophora, Cnidaria, and Placozoa, have body plans that lack bilateral symmetry. Their relationships are still disputed; the sis group to all other animals could be the Porifera or the Ctenophora,[95] both of which lack hox genes, important in body plan development.[96]
These genes are establish in the Placozoa[97] [98] and the higher animals, the Bilateria.[99] [100] 6,331 groups of genes mutual to all living animals accept been identified; these may have arisen from a single common antecedent that lived 650 million years ago in the Precambrian. 25 of these are novel core factor groups, institute just in animals; of those, 8 are for essential components of the Wnt and TGF-beta signalling pathways which may have enabled animals to go multicellular by providing a pattern for the body's system of axes (in 3 dimensions), and another 7 are for transcription factors including homeodomain proteins involved in the control of development.[101] [102]
The phylogenetic tree (of major lineages only) indicates approximately how many millions of years ago (mya) the lineages split.[103] [104] [105] [106] [107]
Non-bilateria
Several brute phyla lack bilateral symmetry. Amidst these, the sponges (Porifera) probably diverged outset, representing the oldest creature phylum.[108] Sponges lack the complex organization found in most other beast phyla;[109] their cells are differentiated, merely in most cases not organised into distinct tissues.[110] They typically feed by drawing in water through pores.[111]
The Ctenophora (comb jellies) and Cnidaria (which includes jellyfish, sea anemones, and corals) are radially symmetric and take digestive chambers with a single opening, which serves as both mouth and anus.[112] Animals in both phyla have singled-out tissues, only these are not organised into organs.[113] They are diploblastic, having only two main germ layers, ectoderm and endoderm.[114] The tiny placozoans are similar, just they do non have a permanent digestive chamber.[115] [116]
Bilateria
The remaining animals, the great bulk—comprising some 29 phyla and over a 1000000 species—form a clade, the Bilateria. The body is triploblastic, with three well-developed germ layers, and their tissues form distinct organs. The digestive chamber has two openings, a mouth and an anus, and there is an internal body cavity, a coelom or pseudocoelom. Animals with this bilaterally symmetric body program and a tendency to motility in one direction have a caput end (anterior) and a tail cease (posterior) every bit well as a back (dorsal) and a abdomen (ventral); therefore they also have a left side and a right side.[117] [118]
Having a front end finish means that this part of the trunk encounters stimuli, such as food, favouring cephalisation, the development of a head with sense organs and a mouth. Many bilaterians have a combination of circular muscles that constrict the torso, making information technology longer, and an opposing set of longitudinal muscles, that shorten the trunk;[118] these enable soft-bodied animals with a hydrostatic skeleton to move by peristalsis.[119] They also have a gut that extends through the basically cylindrical torso from mouth to anus. Many bilaterian phyla have master larvae which swim with cilia and have an apical organ containing sensory cells. However, there are exceptions to each of these characteristics; for case, developed echinoderms are radially symmetric (unlike their larvae), while some parasitic worms have extremely simplified trunk structures.[117] [118]
Genetic studies have considerably changed zoologists' understanding of the relationships inside the Bilateria. Near announced to belong to two major lineages, the protostomes and the deuterostomes.[120] The basalmost bilaterians are the Xenacoelomorpha.[121] [122] [123]
Protostomes and deuterostomes
Protostomes and deuterostomes differ in several means. Early on in development, deuterostome embryos undergo radial cleavage during cell division, while many protostomes (the Spiralia) undergo spiral cleavage.[124] Animals from both groups possess a complete digestive tract, just in protostomes the offset opening of the embryonic gut develops into the rima oris, and the anus forms secondarily. In deuterostomes, the anus forms first while the mouth develops secondarily.[125] [126] Most protostomes have schizocoelous development, where cells simply fill up in the interior of the gastrula to class the mesoderm. In deuterostomes, the mesoderm forms past enterocoelic pouching, through invagination of the endoderm.[127]
The main deuterostome phyla are the Echinodermata and the Chordata.[128] Echinoderms are exclusively marine and include starfish, sea urchins, and ocean cucumbers.[129] The chordates are dominated by the vertebrates (animals with backbones),[130] which consist of fishes, amphibians, reptiles, birds, and mammals.[131] The deuterostomes also include the Hemichordata (acorn worms).[132] [133]
Ecdysozoa
The Ecdysozoa are protostomes, named subsequently their shared trait of ecdysis, growth past moulting.[134] They include the largest brute phylum, the Arthropoda, which contains insects, spiders, crabs, and their kin. All of these have a torso divided into repeating segments, typically with paired appendages. 2 smaller phyla, the Onychophora and Tardigrada, are shut relatives of the arthropods and share these traits. The ecdysozoans besides include the Nematoda or roundworms, possibly the second largest animal phylum. Roundworms are typically microscopic, and occur in nearly every environment where there is water;[135] some are of import parasites.[136] Smaller phyla related to them are the Nematomorpha or horsehair worms, and the Kinorhyncha, Priapulida, and Loricifera. These groups have a reduced coelom, called a pseudocoelom.[137]
Spiralia
The Spiralia are a big group of protostomes that develop by spiral cleavage in the early embryo.[138] The Spiralia'due south phylogeny has been disputed, but information technology contains a large clade, the superphylum Lophotrochozoa, and smaller groups of phyla such as the Rouphozoa which includes the gastrotrichs and the flatworms. All of these are grouped every bit the Platytrochozoa, which has a sis group, the Gnathifera, which includes the rotifers.[139] [140]
The Lophotrochozoa includes the molluscs, annelids, brachiopods, nemerteans, bryozoa and entoprocts.[139] [141] [142] The molluscs, the second-largest animal phylum by number of described species, includes snails, clams, and squids, while the annelids are the segmented worms, such as earthworms, lugworms, and leeches. These two groups take long been considered close relatives because they share trochophore larvae.[143] [144]
History of nomenclature
In the classical era, Aristotle divided animals,[d] based on his own observations, into those with claret (roughly, the vertebrates) and those without. The animals were then bundled on a calibration from human (with blood, 2 legs, rational soul) downwards through the live-bearing tetrapods (with claret, 4 legs, sensitive soul) and other groups such equally crustaceans (no blood, many legs, sensitive soul) down to spontaneously generating creatures like sponges (no blood, no legs, vegetable soul). Aristotle was uncertain whether sponges were animals, which in his system ought to take sensation, appetite, and locomotion, or plants, which did non: he knew that sponges could sense touch on, and would contract if near to be pulled off their rocks, only that they were rooted similar plants and never moved nearly.[146]
In 1758, Carl Linnaeus created the first hierarchical classification in his Systema Naturae.[147] In his original scheme, the animals were ane of 3 kingdoms, divided into the classes of Vermes, Insecta, Pisces, Amphibia, Aves, and Mammalia. Since then the last four have all been subsumed into a unmarried phylum, the Chordata, while his Insecta (which included the crustaceans and arachnids) and Vermes have been renamed or broken upwardly. The procedure was begun in 1793 past Jean-Baptiste de Lamarck, who called the Vermes une espèce de chaos (a chaotic mess)[eastward] and dissever the group into iii new phyla, worms, echinoderms, and polyps (which contained corals and jellyfish). By 1809, in his Philosophie Zoologique, Lamarck had created 9 phyla apart from vertebrates (where he nevertheless had 4 phyla: mammals, birds, reptiles, and fish) and molluscs, namely cirripedes, annelids, crustaceans, arachnids, insects, worms, radiates, polyps, and infusorians.[145]
In his 1817 Le Règne Animal, Georges Cuvier used comparative anatomy to group the animals into 4 embranchements ("branches" with different trunk plans, roughly respective to phyla), namely vertebrates, molluscs, articulated animals (arthropods and annelids), and zoophytes (radiata) (echinoderms, cnidaria and other forms).[149] This division into four was followed by the embryologist Karl Ernst von Baer in 1828, the zoologist Louis Agassiz in 1857, and the comparative anatomist Richard Owen in 1860.[150]
In 1874, Ernst Haeckel divided the animal kingdom into two subkingdoms: Metazoa (multicellular animals, with v phyla: coelenterates, echinoderms, articulates, molluscs, and vertebrates) and Protozoa (unmarried-celled animals), including a sixth animal phylum, sponges.[151] [150] The protozoa were afterward moved to the former kingdom Protista, leaving only the Metazoa equally a synonym of Animalia.[152]
In human civilisation
Practical uses
The man population exploits a big number of other animate being species for food, both of domesticated livestock species in animal husbandry and, mainly at ocean, by hunting wild species.[153] [154] Marine fish of many species are caught commercially for food. A smaller number of species are farmed commercially.[153] [155] [156] Humans and their livestock brand up more than ninety% of the biomass of all terrestrial vertebrates, and nearly as much as all insects combined.[157]
Invertebrates including cephalopods, crustaceans, and bivalve or gastropod molluscs are hunted or farmed for food.[158] Chickens, cattle, sheep, pigs, and other animals are raised as livestock for meat across the world.[154] [159] [160] Beast fibres such as wool are used to make textiles, while animal sinews have been used as lashings and bindings, and leather is widely used to brand shoes and other items. Animals have been hunted and farmed for their fur to make items such as coats and hats.[161] Dyestuffs including carmine (cochineal),[162] [163] shellac,[164] [165] and kermes[166] [167] have been made from the bodies of insects. Working animals including cattle and horses have been used for work and transport from the get-go days of agronomics.[168]
Animals such as the fruit fly Drosophila melanogaster serve a major function in scientific discipline equally experimental models.[169] [170] [171] [172] Animals take been used to create vaccines since their discovery in the 18th century.[173] Some medicines such as the cancer drug Yondelis are based on toxins or other molecules of animal origin.[174]
People have used hunting dogs to assistance chase downward and recall animals,[175] and birds of prey to grab birds and mammals,[176] while tethered cormorants accept been used to catch fish.[177] Poison dart frogs have been used to poison the tips of blowpipe darts.[178] [179] A wide variety of animals are kept as pets, from invertebrates such as tarantulas and octopuses, insects including praying mantises,[180] reptiles such as snakes and chameleons,[181] and birds including canaries, parakeets, and parrots[182] all finding a place. However, the most kept pet species are mammals, namely dogs, cats, and rabbits.[183] [184] [185] There is a tension between the role of animals as companions to humans, and their beingness every bit individuals with rights of their own.[186] A broad variety of terrestrial and aquatic animals are hunted for sport.[187]
Symbolic uses
Animals have been the subjects of art from the earliest times, both historical, equally in Ancient Egypt, and prehistoric, as in the cave paintings at Lascaux. Major animal paintings include Albrecht Dürer's 1515 The Rhinoceros, and George Stubbs's c. 1762 horse portrait Whistlejacket.[188] Insects, birds and mammals play roles in literature and film,[189] such every bit in giant bug movies.[190] [191] [192]
Animals including insects[193] and mammals[194] feature in mythology and organized religion. In both Nihon and Europe, a butterfly was seen as the personification of a person's soul,[193] [195] [196] while the scarab protrude was sacred in aboriginal Arab republic of egypt.[197] Among the mammals, cattle,[198] deer,[194] horses,[199] lions,[200] bats,[201] bears,[202] and wolves[203] are the subjects of myths and worship. The signs of the Western and Chinese zodiacs are based on animals.[204] [205]
Encounter also
- Animal attacks
- Animal coloration
- Ethology
- Fauna
- Listing of creature names
- Lists of organisms past population
Notes
- ^ The application of DNA barcoding to taxonomy further complicates this; a 2016 barcoding analysis estimated a total count of near 100,000 insect species for Canada alone, and extrapolated that the global insect fauna must be in excess of ten 1000000 species, of which virtually 2 million are in a unmarried fly family unit known equally gall midges (Cecidomyiidae).[67]
- ^ Non including parasitoids.[63]
- ^ Compare File:Annelid redone w white background.svg for a more than specific and detailed model of a particular phylum with this general body plan.
- ^ In his History of Animals and Parts of Animals.
- ^ The prefix une espèce de is debasing.[148]
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External links
Wikimedia Eatables has media related to Animals. |
- Tree of Life Project
- Animal Variety Web – University of Michigan's database of animals
- ARKive – multimedia database of endangered/protected species
Source: https://en.wikipedia.org/wiki/Animal
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