Black-headed Gull Identification

Adult Description

  • Small gull.
  • White triangle in outer part of wing.
  • Blackish under tip of wing.
  • Back pale gray.
  • Underparts white.
  • Head dark brown during breeding.
  • Dark spot behind eyes in winter.

Immature Description

Juvenile with much brown on head, neck, and back, a dark bar across the wing, and a black tail tip. Immature similar to nonbreeding adult, but with brownish black bar across the base of the wing, much black in the outer wing, and a black band across the tip of the tail. In first breeding plumage the black head is partly mottled with white.
Relative Size

Relative Sizebetween crow and goosebetween crow and goose
Measurements
  • Both Sexes
    • Length: 13.4-14.6 in (34-37 cm)
    • Weight: 6.7-14.1 oz (190-400 g)
    • Wingspan: 39.4-43.3 in (100-110 cm)