It breeds in central provinces of
Canada and adjacent states of the northern United States. It is a
migratory bird, wintering in
Argentina, the
Caribbean,
Chile, and
Peru. The summer adult's body is white and its back and wings are much darker grey than all other gulls of similar size except the larger
laughing gull. The wings have black tips with an adjacent white band. The bill and legs are red. The black hood of the breeding adult is mostly lost in winter. Young birds are similar to the adult but have less developed hoods and lack the white wing band. They take three years to reach maturity.
Measurements: •
Length: 12.6–14.2 in (32–36 cm) •
Weight: 8.1–10.6 oz (230–300 g) •
Wingspan: 33.5–37.4 in (85–95 cm) ==Distribution==