Duck

Duck is the common name for numerous species of waterfowl in the family Anatidae. They are generally smaller than swans and geese, which are members of the same family.
Ducks are mostly aquatic birds, and may be found in both fresh water and sea water. Ducks are sometimes confused with several types of unrelated water birds with similar forms, such as loons or divers, grebes, gallinules and coots.