duck
A duck is an anatid waterbird with a broad blunt bill, short legs, webbed feet, feathers and a waddling gait. A form taxon, ducks are a grouping together of all members of the family Anatidae that aren't geese or swans — as such, there is no common "duck" ancestor that excludes Anserinae, some clades being more related to said subfamily than others. Ducks consist mostly of the subfamily Anatinae and its tribes, but…
