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406 Topic Pages Found in Animals & Veterinary Medicine
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Open Ants

any of the 2,500 insect species constituting the family Formicidae of the order Hymenoptera, to which the bee and the wasp also belong. Like most

Open Apes

any primate of the superfamily Hominoidea, which includes humans; this article, however, focuses on the nonhuman apes. The small apes, the gibbon and

Open Aphids

Aphids are remarkable, evolutionarily exquisite creatures, and are among the most successful insects. Aphid evolution has been shaped through


name for any supervised exhibit of aquatic animals and plants. Aquariums are known to have been constructed in ancient Rome, Egypt, and Asia. Goldfish

Arabian horse

Small, light, Arabian breed of horse whose qualities of endurance and agility have been introduced into European stock by selective breeding.


( är´´mӘdĭl'ō ), New World armored mammal of the order Edentata, a group that also includes the sloth and the anteater , characterized by peglike

Arrow worm

abstract Chaetognaths are elongate bilaterally symmetrical marine animals, ranging from 0.2 to 12 cm long. They have a distinct head bearing grasping

Open Arthropoda

( ärthrŏp'ӘdӘ ) [Gr.,=jointed feet], largest and most diverse animal phylum. The arthropods include crustaceans , insects , centipedes , millipedes ,


A technique to produce a germ-free environment to protect patients from infection. It is used for any procedure that might introduce infection into


( ôstrā´´lōpĭth'ӘkӘs, –pӘthē'kӘs ), an extinct hominin genus found in Africa between about 4 and 1 million years ago. At least seven species of