Range Description: Ring-billed Gull - Larus delawarensis

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: 29,229 square km; Breeding only: 3,326,896 square km; Wintering only: 20,421 square km; Migration only: 123,460 square km
Caribbean - Wintering only: 225,472 square km
Central America - Wintering only: 5,658 square km
Mexico - Wintering only: 1,576,256 square km
U.S.A. - Resident year-round: 123,291 square km; Breeding only: 1,899,098 square km; Wintering only: 2,317,940 square km; Migration only: 3,440,689 square km