Noun
swimming birds having heavy short-legged bodies and bills with a horny tip: swans; geese; ducks
Source: WordNetIf it looks like a duck, and quacks like a duck, we have at least to consider the possibility that we have a small aquatic bird of the family anatidae on our hands. Douglas Adams
"Cygnus verae sp. n. (Anseriformes: Anatidae) from the Early Pliocene of Sofia (Bulgaria)". Source: Internet
Here, for example, is a small section of text marked up in HTML: Anatidae The family Anatidae includes ducks, geese, and swans, but not the closely related screamers. Source: Internet