Range Description: Gull-billed Tern - Gelochelidon nilotica

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: 19,376 square km; Wintering only: 292,064 square km
Central America - Resident year-round: 72,248 square km; Wintering only: 152,668 square km
Mexico - Resident year-round: 265,888 square km; Wintering only: 245,620 square km
South America - Resident year-round: 966,846 square km; Wintering only: 64,413 square km
U.S.A. - Resident year-round: 206,385 square km; Breeding only: 187,581 square km; Wintering only: 3,998 square km