animal order - the order of animals

Aves, class Aves - birds

anseriform bird - chiefly web-footed swimming birds

Anatidae, family Anatidae - swimming birds having heavy short-legged bodies and bills with a horny tip: swans; geese; ducks

Anseres, suborder Anseres - used in some especially older classifications; coextensive with the family Anatidae

Anhimidae, family Anhimidae - screamers