The world's smallest gull. In breeding plumage it has a black head and dark underwings; it flies low over water to catch insects and small fish.
Breeding adults have a black head, red legs, dark underwings, a gray back, and white underparts. Nonbreeding adults have a white head with a dark spot behind the eye.
It flies low over water, sometimes hovering before dipping or diving to take insects and small fish. It nests in freshwater and brackish wetlands.
An extinction-risk assessment has not been added yet.