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Range Description: Willow Flycatcher - Empidonax traillii

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: 1,146,475 square km
Central America - Wintering only: 143,446 square km; Migration only: 322,976 square km
Mexico - Wintering only: 215,038 square km; Migration only: 1,576,949 square km
South America - Wintering only: 951,532 square km
U.S.A. - Breeding only: 6,144,176 square km; Migration only: 873,207 square km

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