Marine Wildlife Encyclopedia
Great Black-backed Gull Larus marinus
With a wingspan of up to 5 ft (1.7 m), the great black-backed gull is one of the world’s largest gulls. Heavily built, with black upperwings and a powerful bill, the great black-backed gull scavenges food, but it is also a highly predatory bird. It frequently preys on other sea birds and their young, and will attack mammals as large as rabbits. The great black-backed gull breeds alone or in colonies, nesting on cliff ledges or on open ground.