Range Description: Great Black-backed Gull - Larus marinus

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: 250,554 square km; Breeding only: 80,686 square km; Wintering only: 320,000 square km; Migration only: 126,800 square km
U.S.A. - Resident year-round: 49,255 square km; Wintering only: 387,500 square km; Migration only: 89,448 square km