Range Description: Least Tern - Sternula antillarum

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 - Breeding only: 223,285 square km; Wintering only: 1,572,223 square km; Migration only: 4,070 square km
Central America - Breeding only: 4,102 square km; Wintering only: 13,666 square km; Migration only: 8,670 square km
Mexico - Resident year-round: 8,075 square km; Breeding only: 368,271 square km; Wintering only: 1,451 square km; Migration only: 12,019 square km
South America - Wintering only: 565,859 square km
U.S.A. - Breeding only: 737,276 square km; Wintering only: 8,230 square km