Duck is the common name for a large number of species in the waterfowl family Anatidae, which also includes swans and geese. Ducks are divided among many subfamilies in the family Anatidae; They do not represent a monophyletic group (the group of all descendants of a common common descent) but a form taxon, since swans and geese are not considered ducks. Ducks are mostly aquatic birds, mostly small than the swans and geese, and may be found in both fresh water and sea water.
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