Range Description: Black Guillemot - Cepphus grylle

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 - Breeding only: 719,523 square km; Wintering only: 1,509,204 square km
U.S.A. - Breeding only: 16,491 square km; Wintering only: 148,210 square km