Board Thread:Fun and Games/@comment-29711200-20170304052849/@comment-30154040-20170315225323

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