Ducks are relatively small, short-necked, large-billed waterfowls. Their legs are placed rearward (as are those of swans), resulting in a waddling gait. Most ducks differ from swans and geese in that male ducks molt twice annually, females lay large clutches of smooth-shelled eggs, and both sexes have overlapping scales on the skin of the leg and exhibit some differences between sexes in plumage and in call. Ducks mature in the first year and pair only for the season.
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