Saunder's gull  (Larus saundersi)

A small gull with a black hood and nape, but only during the breeding season, Saunder's gull has a white body with pale grey wings and a narrow black tail band. The legs and short bill are black, and the body is squat. Non-breeding birds have a mottled grey hood and nape, and white-tipped wings with black markings on the primaries (2).