Range Description: Lesser Scaup - Aythya affinis

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 - Resident year-round: 2,762 square km; Breeding only: 3,458,797 square km; Wintering only: 41,801 square km; Migration only: 1,252,512 square km
Caribbean - Resident year-round: 6,545 square km; Wintering only: 417,835 square km
Central America - Wintering only: 462,643 square km
Mexico - Wintering only: 1,957,934 square km
South America - Resident year-round: 67,788 square km
U.S.A. - Resident year-round: 166,865 square km; Breeding only: 1,401,506 square km; Wintering only: 2,909,017 square km; Migration only: 3,770,298 square km