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animal virus
Science; General science
A small infectious agent that is unable to replicate outside a living animal cell. Unlike other intracellular obligatory parasites (for example, chlamydiae and rickettsiae), they ...
gaviiformes
Science; General science
A small order of aquatic birds that contains a single living family, the Gaviidae (loons), with five species restricted to the Northern Hemisphere, and a fossil family, the ...
podicipediformes
Science; General science
A small order of aquatic birds that contains only a single living family, the Podicipedidae (grebes), with 20 species found throughout the world. They breed on freshwater, but ...
coliiformes
Science; General science
A small order of birds containing only the family Coliidae with six species (the mousebirds) restricted to Africa. Mousebirds, or colies, are small, grayish to brownish, with a ...
opisthocomiformes
Science; General science
A small order of birds that contains a single family, the Opisthocomidae. Its one species, the hoatzin, is restricted to South America and has been frequently included in the ...
trogoniformes
Science; General science
A small order of birds that contains only the family Trogonidae. Thirty-seven species are found throughout the tropics; two species reach the southern border of the United States. ...
pelecaniformes
Science; General science
A small order of diverse aquatic, mainly marine, fish-eating birds that includes the pelicans (see illustration ), boobies, and cormorants. The members of the order, found ...
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