Range Description: Wilson's Warbler - Cardellina pusilla

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: 5,838,958 square km; Migration only: 965,389 square km
Central America - Wintering only: 314,068 square km; Migration only: 131,628 square km
Mexico - Wintering only: 982,396 square km; Migration only: 972,359 square km
U.S.A. - Breeding only: 2,084,159 square km; Wintering only: 73,301 square km; Migration only: 6,814,890 square km