Duck | Definition, Types, & Facts | Britannica
https://www.britannica.com/animal/duck
WEBduck, any of various species of relatively small, short-necked, large-billed waterfowl. In true ducks—i.e., those classified in the subfamily Anatinae in the waterfowl family Anatidae—the legs are placed rearward, as in swans , rather than forward, as in geese .
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