Distinctive gull endemic to Galápagos. Adult is easy to identify by sooty-gray body, black head, white crescents above and below eye, and pale rump. Juvenile is grayish brown with tan scaling on the back and wings, and a pale rump. Found along the coast, almost never venturing inland or very far out to sea. Forages along beaches and rocky shorelines, and often perches on boats and docks. It has the smallest population of any gull in the world, estimated at less than 1000 birds.