Gulls, or seagulls, are seabirds, usually grey or white, often with black markings on the head or wings. They typically have harsh wailing or squawking calls. Their bills are stout and long and have webbed feet. Most gulls are ground-nesting carnivores which take live food or scavenge opportunistically. Live food often includes molluscs, fish and small birds. Gulls have unhinging jaws which allow them to consume large prey. Gulls are typically coastal or inland species, rarely venturing far out to sea. The large species take up to four years to attain full adult plumage, but two years is typical for small gulls. Large white-headed gulls are typically long-lived birds, with a maximum age of 49 years recorded for the herring gull.
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