Gulls are most closely related to the terns . Gulls are typically medium to large birds, usually grey or white, often with black markings on the head or wings. They typically have harsh wailing or squawking calls, stout, longish bills, and webbed feet. Gull species range in size from 29-76 cm. Most gulls, particularly Larus species, are ground nesting carnivores, which will take live food or scavenge opportunistically. Live food often includes crabs and small fish. Gulls have unhinging jaws which allow them to consume large prey. Apart from the kittiwakes, gulls are typically coastal or inland species, rarely venturing far out to sea. large species take up to four years to attain full adult plumage, but two years is typical for small gulls. Gulls are resourceful, inquisitive and intelligent birds, demonstrating complex methods of communication and a highly developed social structure.
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