vertebrate

thoroughbred that won the triple crown in 1919

thoroughbred that won the triple crown in 1930

thoroughbred that won the triple crown in 1935

thoroughbred that won the triple crown in 1937

thoroughbred that won the triple crown in 1941

thoroughbred that won the triple crown in 1943

thoroughbred that won the triple crown in 1946

thoroughbred that won the triple crown in 1948

thoroughbred that won the triple crown in 1973

thoroughbred that won the triple crown in 1977

thoroughbred that won the triple crown in 1978

incomplete skeleton of female found in eastern Ethiopia in 1974

an unborn or unhatched vertebrate in the later stages of development showing the main recognizable features of the mature animal

(medicine) a grossly malformed and usually nonviable fetus

a human fetus whose weight is less than 0.5 kilogram when removed or expelled from the mother's body

an unborn child; a human fetus

higher vertebrates (reptiles, birds and mammals) possessing an amnion during development

any member of the Amniota

animal living wholly or chiefly in or on water

eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms

fish-like vertebrate with bony plates on head and upper body; dominant in seas and rivers during the Devonian; considered the earliest vertebrate with jaws

any of various mostly cold-blooded aquatic vertebrates usually having scales and breathing through gills

a vertebrate animal possessing true jaws

warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings

small bird; adults talking to children sometimes use these words to refer to small birds

adult male bird

adult female bird

a bird that has built (or is building) a nest

any bird associated with night: owl; nightingale; nighthawk; etc

any bird that migrates seasonally

most primitive avian type known; extinct bird of the Triassic having bird-like jaw and hollow limbs and breastbone with dinosaur-like tail and hind limbs

extinct primitive toothed bird of the Jurassic period having a long feathered tail and hollow bones; usually considered the most primitive of all birds

sparrow-sized fossil bird of the Jurassic period to the Cretaceous period having a keeled breastbone and vestigial tail; found in China; considered possibly the second most primitive of all birds

sparrow-sized fossil bird of the Cretaceous period having a vestigial tail; found in Spain; considered possibly the third most primitive of all birds

extinct primitive toothed bird with a long feathered tail and three free clawed digits on each wing

flightless birds having flat breastbones lacking a keel for attachment of flight muscles: ostriches; cassowaries; emus; moas; rheas; kiwis; elephant birds

birds having keeled breastbones for attachment of flight muscles

perching birds mostly small and living near the ground with feet having 4 toes arranged to allow for gripping the perch; most are songbirds; hatchlings are helpless

chiefly arboreal birds especially of the order Coraciiformes

any of numerous carnivorous birds that hunt and kill other animals

heavy-bodied largely ground-feeding domestic or game birds

usually brightly colored zygodactyl tropical birds with short hooked beaks and the ability to mimic sounds

birds having zygodactyl feet (except for the touracos)

chiefly short-legged arboreal nonpasserine birds that nest in holes

nonpasserine bird having long wings and weak feet; spends much of its time in flight

long-winged nonpasserine birds

any of numerous nonpasserine insectivorous climbing birds usually having strong bills for boring wood

forest bird of warm regions of the New World having brilliant lustrous plumage and long tails

wading and swimming and diving birds of either fresh or salt water

a bird that twitters

cold-blooded vertebrate typically living on land but breeding in water; aquatic larvae undergo metamorphosis into adult form

fossil amphibian of the Devonian having well-developed forelimbs; found in Pennsylvania

early tetrapod amphibian found in Greenland

amphibians that resemble lizards

any of various typically terrestrial amphibians that resemble lizards and that return to water only to breed

any of various tailless stout-bodied amphibians with long hind limbs for leaping; semiaquatic and terrestrial species

any of the small slender limbless burrowing wormlike amphibians of the order Gymnophiona; inhabit moist soil in tropical regions

an amphibian of the superorder Labyrinthodontia

any cold-blooded vertebrate of the class Reptilia including tortoises, turtles, snakes, lizards, alligators, crocodiles, and extinct forms

primitive reptile having no opening in the temporal region of the skull; all extinct except turtles

reptile having a pair of openings in the skull behind each eye

used in former classifications to include all living reptiles except turtles; superseded by the two subclasses Lepidosauria and Archosauria

extinct reptile having a single pair of lateral temporal openings in the skull

any warm-blooded vertebrate having the skin more or less covered with hair; young are born alive except for the small subclass of monotremes and nourished with milk

animals that nourish their young with milk

any mammal with prominent tusks (especially an elephant or wild boar)

primitive oviparous mammals found only in Australia and Tasmania and New Guinea

primitive pouched mammals found mainly in Australia and the Americas

mammals having a placenta; all mammals except monotremes and marsupials

a burrowing mammal having limbs adapted for digging

a vertebrate animal having four feet or legs or leglike appendages

an animal especially a mammal having four limbs specialized for walking