|Anseriformes is an order of birds. It comprises about 150 living species in three families: Anhimidae (the screamers), Anseranatidae (the Magpie Goose), and Anatidae, the largest family, which includes over 140 species of waterfowl, among them the ducks, geese, and swans.
All species in the order are highly adapted for an aquatic existence at the water surface. All are web-footed for efficient swimming (although some have subsequently become mainly terrestrial).
For more information, visit the Wikipedia entry.
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