Duck is the common name for a number of bird species in the duck family (Anatidae). All Anatidae species are called "ducks", except for the Anserinae subfamily, geese and swans. Ducks are mainly aquatic birds, usually smaller than their relatives.

Stock photo: Duck is the common name for a number of bird species in the duck family (Anatidae). All Anatidae species are called "ducks", except for the Anserinae subfamily, geese and swans. Ducks are mainly aquatic birds, usually smaller than their relatives. was taken by knol .