- 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 DescriptionJuvenile 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.