Range Description: Heermann's Gull - Larus heermanni

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 - Wintering only: 44,341 square km
Mexico - Resident year-round: 3,532 square km; Wintering only: 550,793 square km
U.S.A. - Wintering only: 186,369 square km; Migration only: 14,698 square km