Range Description: Least Bittern - Ixobrychus exilis

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: 69,139 square km
Caribbean - Resident year-round: 227,838 square km
Central America - Resident year-round: 12,910 square km; Wintering only: 496,282 square km
Mexico - Resident year-round: 497,458 square km; Wintering only: 501,971 square km; Migration only: 955,430 square km
South America - Resident year-round: 2,330,248 square km
U.S.A. - Resident year-round: 158,362 square km; Breeding only: 2,933,190 square km; Migration only: 17 square km