Tundra Swan (Cygnus columbianus) is a species of birds (Aves) of the class Aves (Birds) in the family Anatidae (Ducks, Geese, and Waterfowl) and order Anseriformes (Ducks).
Cygnus atratus
Cygnus melancoryphus
Cygnus olor
Cygnus buccinator
Cygnus columbianus
Cygnus cygnus