Range Description: Sandwich Tern - Thalasseus sandvicensis

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:

Caribbean - Resident year-round: 4,116 square km; Wintering only: 1,206,826 square km
Central America - Wintering only: 185,481 square km
Mexico - Resident year-round: 98 square km; Wintering only: 144,895 square km
South America - Resident year-round: 747,447 square km; Wintering only: 523,560 square km
U.S.A. - Resident year-round: 99,555 square km; Breeding only: 8,758 square km; Wintering only: 173,007 square km; Migration only: 17,465 square km