Range Description: Common Merganser - Mergus merganser

Summary of the extent of the breeding, wintering, migration and year-round range of this species in the Western Hemisphere, including Canada, U.S.A. and Mexico:

Canada - Resident year-round: 663,226 square km; Breeding only: 4,411,659 square km; Wintering only: 236,819 square km; Migration only: 454,384 square km
Mexico - Wintering only: 195,781 square km
U.S.A. - Resident year-round: 1,901,502 square km; Breeding only: 426,377 square km; Wintering only: 3,832,820 square km; Migration only: 453,735 square km