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. The result is a distinctive waddling gait.
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