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any of the 150 species comprising the bird order Anseriformes, which comprises the ducks, geese, and swans (family Anatidae) and the screamers (the three species of family Anhimidae). Anatidae comprises about 147 species of medium to large birds, usually associated with freshwater or marine habitats. This family is known collectively as waterfowl (in the United States) or wildfowl (in Europe). The three species of screamers are quite different from waterfowl in general appearance. They are moderately long-legged birds about the size of a turkey, with chickenlike beaks and exceptionally large feet