A Great Black-backed Gull lands on a sign in a marina that reads 'Danger.'

A chick of a Great Black-backed Gull (Larus marinus), on Staple Island, Farne Islands, Northumberland, England, United Kingdom, Europe

Juvenile Great black-backed gull (Larus marinus) in flight, UK

Great black-backed gull (Larus marinus) and shag (Phalacrocorax aristotelis) sharing a rock. Hebrides, Scotland.

Greater Black-back Gull chick (Larus marinus). British Channel Islands

Glaucous gull (Larus hyperboreus) parents with chick on Hornsund on the Southwest side of Spitsbergen in the Svalbard Archipelago in the Barents Sea, Norway.

Juvenile Great black-backed gull (Larus marinus) in flight, UK

White-tailed Eagle or Sea eagle (Haliaeetus albicilla) in flight with prey, and Great Black-backed Gull (Larus marinus) behind, Flatanger, Nordtrondelag, Norway, Scandinavia, Europe

White-tailed Eagle or Sea eagle (Haliaeetus albicilla) in flight with prey, badgered by a Great Black-backed Gull (Larus marinus) behind, Flatanger, Nordtrondelag, Norway, Scandinavia, Europe

Close-up of a bird on a wooden post

Great Black-backed Gulls with a comb in the beak, France