Which bird has only two toes on each foot?
"of the members of the Burhinidae family is misnomer because their heels are large. The chicks in the orders Coraciiformes and Piciformes have ankles covered by a patch of tough skins with tubercles known as the ""heel-pad"". They use the heel-pad to shuffle inside the nest cavities or holes. Most birds have four toes, typically three facing forward and one pointing backward. In a typical perching bird, they consist respectively of 3, 4, 5 and 2 phalanges. Some birds, like the sanderling, have only the forward-facing toes; these are called tridactyl feet. Others, like the ostrich, have only two toes"
"Hoffmann's two-toed sloth Hoffmann's two-toed sloth (""Choloepus hoffmanni"") is a species of sloth from Central and South America. It is a solitary, largely nocturnal and arboreal animal, found in mature and secondary rainforests and deciduous forests. The common name commemorates the German naturalist Karl Hoffmann. Hoffmann's two-toed sloth is a heavily built animal with shaggy fur and slow, deliberate movements. The fore feet have only two toes, each ending with long, curved claws, although three clawed toes are on each of the hind feet. Other features that distinguish it from three-toed sloths, which may be found in the same geographic"
"Two-toed sloth Choloepus is a genus of mammals of Central and South America, within the family Megalonychidae consisting of two-toed sloths. The two species of ""Choloepus"" (which means ""lame foot""), Linnaeus's two-toed sloth (""Choloepus didactylus"") and Hoffmann's two-toed sloth (""Choloepus hoffmanni""), are the only surviving members of the family Megalonychidae. A study of retrovirus and mitochondrial DNA suggests that ""C. didactylus"" and ""C. hoffmani"" diverged 6 to 7 million years ago. Furthermore, based on cytochrome c oxidase subunit I sequences, a similar divergence date ( years ago) between the two populations of ""C. hofmanni"" separated by the Andes has been"
"Monopod (creature) Monopods (also sciapods, skiapods, skiapodes) are mythological dwarf-like creatures with a single, large foot extending from a leg centered in the middle of their bodies. The names ""monopod"" and ""skiapod"" (σκιάποδες) are both Greek, respectively meaning ""one-foot"" and ""shadow-foot"". Monopods appear in Aristophanes' play ""The Birds"", first performed in 414 BC. They are described by Pliny the Elder in his ""Natural History"", where he reports travelers' stories from encounters or sightings of Monopods in India. Pliny remarks that they are first mentioned by Ctesias in his book ""Indika"" (India), a record of the view of Persians of India"
"Hoatzin The hoatzin (""Opisthocomus hoazin""), also known as the reptile bird, skunk bird, stinkbird, or Canje pheasant, is a species of tropical bird found in swamps, riparian forests, and mangroves of the Amazon and the Orinoco basins in South America. It is notable for having chicks that have claws on two of their wing digits. It is the only member of the genus Opisthocomus (Ancient Greek: ""wearing long hair behind"", referring to its large crest), which in turn is the only extant genus in the family Opisthocomidae. The taxonomic position of this family has been greatly debated, and is still"
"vertebrae, which may be due to mutations in the homeotic genes. All other mammals have seven cervical vertebrae, other than the three-toed sloth and the manatee. (1758): Systema naturae perregna tria naturae, secundum classes, ordines, genera, species cum characteribus, differentiis, syonymis, locis. Laurentii :) Salvi, 824pp. Two-toed sloth Choloepus is a genus of mammals of Central and South America, within the family Megalonychidae consisting of two-toed sloths. The two species of ""Choloepus"" (which means ""lame foot""), Linnaeus's two-toed sloth (""Choloepus didactylus"") and Hoffmann's two-toed sloth (""Choloepus hoffmanni""), are the only surviving members of the family Megalonychidae. A study of retrovirus"
"by a one-footed man, and Thorvald dies from an arrow-wound: Umberto Eco in his novel ""Baudolino"" describes a sciapod named Gavagai. The name of the creature ""Gavagai"" is a reference to Quine's example of indeterminacy of translation. Monopod (creature) Monopods (also sciapods, skiapods, skiapodes) are mythological dwarf-like creatures with a single, large foot extending from a leg centered in the middle of their bodies. The names ""monopod"" and ""skiapod"" (σκιάποδες) are both Greek, respectively meaning ""one-foot"" and ""shadow-foot"". Monopods appear in Aristophanes' play ""The Birds"", first performed in 414 BC. They are described by Pliny the Elder in his ""Natural"
"The genus, ""Pandion"", is the sole member of the family Pandionidae, and used to contain only one species, the osprey (""P. haliaetus""). The genus ""Pandion"" was described by the French zoologist Marie Jules César Savigny in 1809. Most taxonomic authorities consider the species cosmopolitan and conspecific. A few authorities split the osprey into two species, the western osprey and the eastern osprey. The osprey differs in several respects from other diurnal birds of prey. Its toes are of equal length, its tarsi are reticulate, and its talons are rounded, rather than grooved. The osprey and owls are the only raptors"
"and the manatee, which have only six. Three-toed sloth The three-toed sloths are tree-living mammals from South and Central America. They are the only members of the genus Bradypus and the family Bradypodidae. The four living species of three-toed sloths are the brown-throated sloth, the maned sloth, the pale-throated sloth, and the pygmy three-toed sloth. A study of mitochondrial cytochrome b and 16S rRNA sequences suggests that ""B. torquatus"" diverged from ""B. variegatus"" and ""B. tridactylus"" about 12 million years ago, while the latter two split 5 to 6 million years ago. The diversification of ""B. variegatus"" lineages was estimated"
"resplendent quetzal (not including the male quetzal's tail streamers). Their legs and feet are weak and short, and trogons are essentially unable to walk beyond a very occasional shuffle along a branch. They are even incapable of turning around on a branch without using their wings. The ratio of leg muscle to body weight in trogons is only 3 percent, the lowest known ratio of any bird. The arrangement of toes on the feet of trogons is also unique among birds, although essentially resembling the zygodactyl's two forward two backward arrangement of parrots and other near-passerines, the actual toes are"
"to extinction. The 2004 tsunami is believed to have wiped out populations on some islands and reduced populations on several others. Megapodes are so named for their large feet and like others in the group, this species is fowl like with dark brown plumage, a short tail and large feet and claws. The tarsus is bare with the hind toe situated on the same level as the front toes unlike those of other Galliform birds, enabling them to grasp objects better than other game birds. The tarsus has broad flat strip like scales on the front. The tail is short"
"Bird feet and legs The anatomy of bird legs and feet is diverse, encompassing many accommodations to perform a wide variety of functions. Most birds are classified as digitigrade animals, meaning they walk on their toes, rather than the entire foot. Some of the lower bones of the foot (the distals and most of the metatarsal) are fused to form the tarsometatarsus – a third segment of the leg, specific to birds. The upper bones of the foot (proximals), in turn, are fused with the tibia to form the tibiotarsus, as over time the centralia disappeared. The fibula also reduced."
"ancient pseudotooth bird, seabirds of unclear affiliation that evolved to immense proportions in the Neogene but by the time of ""Laornis"" probably were mostly the size of a large petrel. Laornis Laornis is a genus of a prehistoric neornithine birds, known only from Specimen YPM 820, a single tibiotarsus leg bone discovered in the late 19th century. Consequently, the genus is monotypic, containing only the species Laornis edvardsianus. Regarding its scientific name, ""Laornis"" means ""stone bird"", from Ancient Greek ""lao"" ""stone"" + ""ornis"" ""bird"". ""edvardsianus"" honors Alphonse Milne-Edwards, to compliment the French paleontologist on his landmark study ""Recherches Anatomiques et"
"of approximately 7.3 years. Their legs and feet are short and weak which makes them unable to walk, instead they are limited to the occasional shuffle along a branch. The ratio of leg muscle to body weight in all Trogonidae species is only 3%, the lowest known ratio of any bird. The arrangement of the toes on Trogonidae species feet is also unique among birds and are arranged with the third and fourth toes projecting forward and the first and second toes projecting backwards, an arrangement known as heterodactylous. Because of this arrangement, the red-naped trogon is unable to turn"
"Laornis Laornis is a genus of a prehistoric neornithine birds, known only from Specimen YPM 820, a single tibiotarsus leg bone discovered in the late 19th century. Consequently, the genus is monotypic, containing only the species Laornis edvardsianus. Regarding its scientific name, ""Laornis"" means ""stone bird"", from Ancient Greek ""lao"" ""stone"" + ""ornis"" ""bird"". ""edvardsianus"" honors Alphonse Milne-Edwards, to compliment the French paleontologist on his landmark study ""Recherches Anatomiques et Paleontologiques pour servir a l'Histoire des Oiseaux Fossiles de la France"", the second part of which was nearing completion at that time. It was found in Late Cretaceous or Early"
"Tarsometatarsus The tarsometatarsus is a bone that is only found in the lower leg of birds and some non-avian dinosaurs. It is formed from the fusion of several bones found in other types of animals, and homologous to the mammalian tarsus (ankle bones) and metatarsal bones (foot). Despite this, the tarsometatarsus of birds is often referred to as just the tarsus or metatarsus. Tarsometatarsal fusion occurred in several ways and extents throughout bird evolution. Specifically, in Neornithes (modern birds), although the bones are joined along their entire length, the fusion is most thorough at the distal (metatarsal) end. In the"
"Tarsometatarsus The tarsometatarsus is a bone that is only found in the lower leg of birds and some non-avian dinosaurs. It is formed from the fusion of several bones found in other types of animals, and homologous to the mammalian tarsus (ankle bones) and metatarsal bones (foot). Despite this, the tarsometatarsus of birds is often referred to as just the tarsus or metatarsus. Tarsometatarsal fusion occurred in several ways and extents throughout bird evolution. Specifically, in Neornithes (modern birds), although the bones are joined along their entire length, the fusion is most thorough at the distal (metatarsal) end. In the"
"Two-toed amphiuma The two-toed amphiuma (""Amphiuma means"") is a snake-like salamander found chiefly in the southeastern United States. It is commonly, but incorrectly, called ""congo snake"", ""conger eel"" or the ""blind eel"". One of the largest extant species of amphibians in the world, they can grow from in mass and from in length. They have four vestigial legs that end in two or three toes which are virtually useless, and eyes without lids. They are blue-black in color. They feed on small fish, crawfish, insect larvae, and even small snakes; they are harmless to humans when left alone, but when"
"and ""pous"", ""foot"". Coots and phalaropes both have lobed toes. The specific ""lobatus"" is New Latin for lobed, for the same reason. This bird was described in 1750 as the ""Coot-footed Tringa"". The red-necked phalarope is about in length, with lobed toes and a straight, fine bill. The breeding female is predominantly dark grey above, with a chestnut neck and upper breast, black face and white throat. They have a white wing stripe which helps distinguish this bird from the similar Wilson's phalarope. The breeding male is a duller version of the female. They have lobed toes to assist with"
"family Nymphalidae, or brush-footed butterflies as they are commonly known, have only the rear two pairs of legs fully functional with the forward pair strongly reduced and not capable of walking or perching. In the Lycaenidae, the tarsus is unsegmented, as the tarsomeres are fused, and, tarsal claws are absent. The aroliar pad (a pad projecting between the tarsal claws of some insects) and pulvilli (singular: pulvillus, a pad or lobe beneath each tarsal claw) are reduced or absent in the Papilionidae. The tarsal claws are also absent in the Riodinidae. In Lepidoptera, the three pairs of legs are covered"
"has three toes directed forward and one toe directed backward, called anisodactyl arrangement. This arrangement enables the passerine birds to perch upon vertical surfaces, such as trees and cliffs. The toes have no webbing or joining, but in some cotingas, the second and third toes are united at their basal third. The hind toe joins the leg at the same level as the front toes. The passeriformes have this toe arrangement in common with hunting birds like eagles and falcons. The leg arrangement of passerine birds contains a special adaptation for perching. A tendon in the rear of the leg"
"four genera, containing 24 species occur. The genus ""Apaloderma"" contains the three African species. The genera ""Harpactes"" and ""Apalharpactes"", containing twelve species, are found in southeast Asia. They feed on insects and fruit, and their broad bills and weak legs reflect their diet and arboreal habits. Although their flight is fast, they are reluctant to fly any distance. Trogons are generally not migratory, although some species undertake partial local movements. Trogons have soft, often colourful, feathers with distinctive male and female plumage. They are the only type of animal with a heterodactyl toe arrangement. They nest in holes dug into"
"forage on trunks. Exceptions are the black-backed woodpecker and the American and Eurasian three-toed woodpeckers, which have only three toes on each foot. The tails of all woodpeckers, except the piculets and wrynecks, are stiffened, and when the bird perches on a vertical surface, the tail and feet work together to support it. Woodpeckers have strong bills for drilling and drumming on trees, and long sticky tongues for extracting food (insects and larvae). Woodpecker bills are typically longer, sharper and stronger than the bills of piculets and wrynecks; however, their morphology is very similar. The bill's chisel-like tip is kept"
"each class are highlighted here, but this is not a complete listing. Of the three orders of amphibians, Anura (frogs and toads) and Urodela (salamanders) have representative species with webbed feet. Frogs that live in aquatic environments, like the common frog (""Rana temporaria""), have webbed feet. Salamanders in arboreal and cave environments also have webbed feet, but in most species, this morphological change does not likely have a functional advantage. Reptiles have webbed-footed representatives that include freshwater turtles and geckos. While turtles with webbed feet are aquatic, most geckos live in terrestrial and arboreal environments. Birds are typically classified as"
"to climbing than to flight, since most flying birds have relatively short hands. Zhang ""et al."" also noted that the foot of ""Scansoriopteryx"" is unique among non-avian theropods; while ""Scansoriopteryx"" does not preserve a reversed hallux (the backward-facing toe seen in modern perching birds), its foot was very similar in construction to primitive perching birds like ""Cathayornis"" and ""Longipteryx"". These adaptations for grasping ability in all four limbs, the authors argued, makes it likely that ""Scansoriopteryx"" spent a significant amount of time living in trees. In describing ""Scansoriopteryx"", Czerkas and Yuan also described evidence for an arboreal lifestyle. They noted"
"diurnal birds of prey, toes are of equal length, its tarsi are reticulate, and its talons are rounded, rather than grooved. The eastern and western osprey (""Pandion"") and owls (Strigiformes) are the only hunters whose outer toe is reversible, allowing them to grasp their prey with two toes in front and two behind. This is particularly helpful when they grasp slippery fish. The states and territories of Australia where the species is recorded as occurring are Western Australia, the Northern Territory, Queensland, South Australia and Tasmania, The range is a narrow strip at the coast and offshore islands, although it"
"anisodactyly, except that the third and fourth toes (the outer and middle forward-pointing toes), or three toes, are fused together, as in the belted kingfisher (""Megaceryle alcyon""). This is characteristic of Coraciiformes (kingfishers, bee-eaters, rollers, and relatives). Zygodactyly (from Greek ζυγος, even) is an arrangement of digits in birds and chameleons, with two toes facing forward (digits 2 and 3) and two back (digits 1 and 4). This arrangement is most common in arboreal species, particularly those that climb tree trunks or clamber through foliage. Zygodactyly occurs in the parrots, woodpeckers (including flickers), cuckoos (including roadrunners), and some owls. Zygodactyl"
"Sloth Sloths are arboreal mammals noted for slowness of movement and for spending most of their lives hanging upside down in the trees of the tropical rainforests of South America and Central America. The six species are in two families: two-toed sloths and three-toed sloths. In spite of this traditional naming, all sloths actually have three toes. The two-toed sloths have two digits, or fingers, on each forelimb. The sloth is so named because of its very low metabolism and deliberate movements, ""sloth"" being related to the word ""slow"". This is an evolutionary adaptation to their low-energy diet of leaves,"
"Andean flamingo The Andean flamingo (""Phoenicoparrus andinus"") is one of the rarest flamingos in the world. It lives in the Andes mountains of South America. Until 2014, it was classified in genus ""Phoenicopterus"". It is closely related to James's flamingo, and the two make up the genus ""Phoenicoparrus"". The Chilean flamingo, Andean flamingo, and James's flamingo are all sympatric, and all live in colonies (including shared nesting areas). The flamingo has a pale pink body with brighter upperparts, deep vinaceous-pink lower neck, breast, and wing coverts. It is the only flamingo species with yellow legs and three-toed feet. The bill"
"Heliornithidae The Heliornithidae are a small family of tropical birds with webbed lobes on their feet like those of grebes and coots. The family overall are known as finfoots, although one species is known as a sungrebe. The family is composed of three species in three genera. Finfoots resemble rails; they have long necks, slender bodies, broad tails, and sharp, pointed bills. They have a diverse range of calls, but do not call frequently. Their legs and feet are brightly coloured and, unlike grebes, they are capable of walking well and even moving quickly on land. Finfoots are found in"
"Tooth-billed bowerbird The tooth-billed bowerbird (""Scenopoeetes dentirostris"") also known as stagemaker bowerbird and tooth-billed catbird is a medium-sized, approximately long, stocky olive-brown bowerbird with brown-streaked buffish white below, grey feet, brown iris and unique tooth-like bill. Both sexes are similar, however the female is slightly smaller than the male. It is the only member in monotypic genus ""Scenopoeetes"". An Australian endemic, the tooth-billed bowerbird is distributed to mountain forests of northeast Queensland. Its diet consists mainly of fruits and young leaves of forest trees. The male is polygamous and builds a display-court or """"stage-type bower"""", decorated with fresh green leaves"
"(didactyl feet). The first digit, called the hallux, is homologous to the human big toe. The claws are located on the extreme phalanx of each toe. They consist of a horny keratinous podotheca, or sheath, and are not part of the skeleton. The bird foot also contains one or two metatarsals not fused in the tarsometatarsus. The legs are attached to a very strong, lightweight assembly consisting of the pelvic girdle extensively fused with the uniform spinal bone called the synsacrum, which is specific to birds. The synsacrum is built from the lumbar fused with the sacral, some of the"
"on a A$200 commemorative coin released in 1992. The anthropomorphic echidna ""Millie"" was a mascot for the 2000 Summer Olympics. Short-beaked echidna The short-beaked echidna (""Tachyglossus aculeatus"") is one of four living species of echidna and the only member of the genus Tachyglossus. It is covered in fur and spines and has a distinctive snout and a specialized tongue, which it uses to catch its insect prey at a great speed. Like the other extant monotremes, the short-beaked echidna lays eggs; the monotremes are the only group of mammals to do so. The short-beaked echidna has extremely strong front limbs"