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

Anatidae is the biological family that includes the ducks and most duck-like waterfowl, such as geese and swan. The Magpie-goose is no longer considered to be part of the Anatidae, but is placed in its own family Anseranatidae. These are birds that are modified for swimming, floating on the water surface, and in some cases diving in at least shallow water.