Great black-backed gulls are opportunistic feeders, apex predators, and are very curious. They will investigate any small organism they encounter and will readily eat almost anything that they can swallow. They are highly predatory and frequently hunt and kill any prey smaller than themselves, behaving more like a raptor than a typical larid gull. Lacking the razor-sharp talons and curved, tearing beak of a raptor, the great black-backed gull relies on aggression, physical strength and endurance when hunting. When attacking other animals, they usually attack seabird eggs, nestlings or fledgings at the nest, perhaps most numerously terns.