| bewick's swan | (n) Eurasian subspecies of tundra swan; smaller than the whooper, Syn. Cygnus columbianus bewickii |
| tundra swan | (n) swan that nests in tundra regions of the New and Old Worlds, Syn. Cygnus columbianus |
| whistling swan | (n) North American subspecies of tundra swan having a soft whistling note, Syn. Cygnus columbianus columbianus |