Zoology

the excretory opening at the end of the alimentary canal

a club used for hitting a ball in various games

large semiaquatic rodent with webbed hind feet and flat tail

any of several small Old World finches

a semiaquatic reptile of Central and South America that resembles an alligator but has a more heavily armored belly

a sharp sound made by small birds or insects

the organs and tissues involved in circulating blood and lymph through the body

any of numerous chiefly nocturnal insects

radially symmetrical animals having saclike bodies with only one opening and tentacles with stinging structures; they occur in polyp and medusa forms

a theory of organic evolution claiming that new species arise and are perpetuated by natural selection

any gland having ducts that pour secretions into the digestive tract

the system that makes food absorbable into the body

terrestrial worm that burrows into and helps aerate soil

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

tallest living quadruped

a large plant-eating animal often found near African rivers

an animal that has a body temperature that is relatively constant and independent of the environmental temperature

beginning with the cecum and ending with the rectum

large and complicated reddish-brown glandular organ located in the upper right portion of the abdominal cavity; secretes bile and functions in metabolism of protein and carbohydrate and fat; synthesizes substances involved in the clotting of the blood; synthesizes vitamin A; detoxifies poisonous substances and breaks down worn-out erythrocytes

predacious long-bodied large-eyed insect of warm regions

agile slender-bodied arboreal mustelids somewhat larger than weasels

large northern deer with enormous flattened antlers in the male; called `elk' in Europe and `moose' in North America

freshwater carnivorous mammal having webbed and clawed feet and dark brown fur

an animal whose body temperature varies based on its surroundings

having more than one husband at a time

having more than one mate at a time

in some classifications considered a superphylum or a subkingdom; comprises flagellates; ciliates; sporozoans; amoebas; foraminifers

large Arctic and subarctic grouse with feathered feet and usually white winter plumage

Arctic deer with large antlers in both sexes

organs and tissues involved in the production and maturation of gametes and in their union and subsequent development as offspring

the system for taking in oxygen and giving off carbon dioxide; in terrestrial animals this is accomplished by breathing

cud-chewing hoofed mammal with a stomach with compartments

any of three pairs of glands in the mouth and digestive system that secrete saliva for digestion

the longest part of the alimentary canal

predatory arachnid with eight legs, two poison fangs, two feelers, and usually two silk-spinning organs at the back end of the body; they spin silk to make cocoons for eggs or traps for prey

a major part of the central nervous system which conducts sensory and motor nerve impulses to and from the brain; a long tubelike structure extending from the base of the brain through the vertebral canal to the upper lumbar region

make a high-pitched, screeching noise

a kind of tree-dwelling rodent with a long bushy tail

enlarged and muscular saclike organ of the alimentary canal

(biology) taxonomic group that is a subdivision of an order

someone who sets traps for animals

any of various aquatic and land reptiles having a bony shell and flipper-like limbs for swimming

a flying insect with a narrow waist and smooth body

a movable organ for flying (one of a pair)

any of numerous relatively small elongated soft-bodied animals especially of the phyla Annelida and Chaetognatha and Nematoda and Nemertea and Platyhelminthes; also many insect larvae