Ismaele Tortella / Black-legged kittiwake (Rissa tridactyla) nesting above a window, Lofoten, Norway, August.

Tony Heald / Glaucous Gull (Larus hyperboreus) taking off from ice, Svalbard Norway, July.

Espen Bergersen / Aerial shot of a fishing boat catching Atlantic herring (Clupea harenguis), with Killer whales (Orcinus orca) and Humpback whales (Megaptera novaeangliae) swimming around the boat and large numbers of...

Espen Bergersen / Aerial shot of a fishing boat catching Atlantic herring (Clupea harenguis), with Killer whales (Orcinus orca) and Humpback whales (Megaptera novaeangliae) swimming around the boats and large numbers o...

Ernie Janes / RF - Herring gull (Larus argentatus) with blue sky, England, UK, Digital composite. (This image may be licensed either as rights managed or royalty free.)

John Chan / Elegant tern (Thalasseus elegans) with a broken wing, attempting to take off, Southern California, USA, April.

John Chan / Western gulls (Larus occidentalis) attacking an Elegant tern (Thalasseus elegans) with a broken wing, Southern California, USA, April.

John Chan / Western gull (Larus occidentalis) feeding on a California two-spot octopus (Octopus bimaculoides) on a mudflat at low tide, Southern California, USA, November.

Oscar Dewhurst / Black-legged kittiwake (Rissa tridactyla) adult perched on the side of the Tyne Bridge, overlooking Newcastle and the Tyne. Newcastle, UK. July

Oscar Dewhurst / Black-legged kittiwake (Rissa tridactyla) adults and chicks on nests on the Tyne Bridge. Newcastle, UK. July.

Markus Varesvuo / Herring Gull (Larus argentatus) close up of juvenile in flight, Flatanger, Norway, October.

Tui De Roy / Swallow-tailed gull (Creagrus furcatus) Plazas Island, Galapagos

Tui De Roy / Swallow-tailed gull (Creagrus furcatus) calling, Genovesa Island, Galapagos

Tui De Roy / Swallow-tailed gull (Creagrus furcatus) in flight, Genovesa Island, Galapagos

Dave Bevan / Juvenile Herring gull (Larus argentatus) pecking a suckling Grey seal (Halichoerus grypus) pup, Norfolk, England, UK. December.

Ernie Janes / RF- Lesser black-backed gulls (Larus fuscus) calling from shoreline, beaks open, England, UK, May. (This image may be licensed either as rights managed or royalty free.)

Bence Mate / Herring gull (Larus argentatus) mobbing White tailed sea eagle (Haliaeetus albicilla) with fish prey, Lake Csaj, Kiskunsagi National Park, Hungary. March.

Bence Mate / Caspian gulls (Larus cachinnans) juveniles fighting, Lake Csaj, Kiskunsagi National Park, Pusztaszer, Hungary. March.

Cyril Ruoso / Atlantic puffin (Larus tridactyla) seen from burrow, Iceland, July.

Pal Hermansen / Kittiwake (Rissa tridactyla) breeding on house wall, Norway, March.

Staffan Widstrand / Kittiwakes (Rissa tridactyla) nesting on wall of house, Vardo town, Varanger Peninsula, Norway, March.

Espen Bergersen / Kittiwakes (Rissa tridactyla) squabbling on ice. Svalbard, Norway. July

Nick Upton / Adult Herring gull (Larus argentatus) scavenging left over food, St.Ives, Cornwall, UK, June. Editorial use only.

Nick Upton / Adult Herring gull (Larus argentatus) walking among sunbathers on beach, St.Ives, Cornwall, UK, June. Editorial use only.

Ole Jorgen Liodden / Ivory gull (Pagophila eburnea) behind Polar bear (Ursus maritimus) framed by its legs, Svalbard, Norway, July.

Ole Jorgen Liodden / Ivory gull (Pagophila eburnea) behind Polar bear (Ursus maritimus), Svalbard, Norway, July.

Erlend Haarberg / Black-legged kittiwakes (Rissa tridactyla) fighting mid air, Hornoeya. Finnmark, Norway, July.

Ben Cranke / European Herring Gull (Larus argentatus) landing on the waters of a fjord, Norway, May.

Ben Cranke / European Herring Gulls (Larus argentatus) in flight at sunset Norway, May.

Ben Cranke / European Herring Gull (Larus argentatus) taking off, Norway, May.

Jeff Rotman / Fishermen clean Atlantic Cod (Gadus morhua) on deck of fishing trawler, with herring gulls (Larus argentatus) flocking in the background. Stellwagen Banks, New England, United States, North Atlantic O...

Juan Carlos Munoz / Two juvenile Atlantic yellow legged gulls (Larus michahellis) in flight, Izmir, Turkey, October.

Markus Varesvuo / Kittiwake (Rissa tridactylus) vocalising, Vardo, Norway, March.

Markus Varesvuo / Large flock of Kittiwakes (Rissa tridactyla) flying over the sea, Vardo, Norway, March.

Theo Bosboom,Theo Bosboom / Gulls, predominantly Iceland gulls (Larus glaucoides) flying above stormy ocean near Vik, Iceland, March 2012.

Mark Carwardine / Gulls flying above two Killer whales / Orcas (Orcinus orca) surfacing, Tysfjord, Norway, November

Billy Black / Gull (Larinae) sitting on mooring ball in calm waters on misty day. Robinhood, Maine, USA, July 2010.

Mark Bowler / Large flock of roosting Grey gulls (Leucophaeus modestus) on beach with coastal fog over the Atacama Desert on the Peruvian coast, Paracas National Park, Peru.

Juergen Freund / Seagull in flight

Espen Bergersen / Herring gull (Larus argentatus) flying over the enormous black beach close to Dyrhoaley, Iceland, May 2016.

Ann & Steve Toon / Kelp (Cape) gulls (Larus dominicanus) feeding on Cape fur seal carcass, Western Cape, South Africa.

Mike Read / Black-legged kittiwake (Rissa tridactyla) group in flight from the 'Angus' tour boat to the Treshnish Isles, Scotland, May.

Staffan Widstrand / Kittiwake colony (Rissa tridactyla) on cliffs, Syltefjordstauran, Varanger peninsula, Arctic Norway

Staffan Widstrand / Kittiwake colony (Rissa tridactyla) on cliffs, Syltefjordstauran, Varanger peninsula, Arctic Norway

Staffan Widstrand / Kittiwake colony (Rissa tridactyla) on cliffs, Syltefjordstauran, Varanger peninsula, Arctic Norway

Sergio Hanquet / Yellow-legged gull (Larus michahellis), juvenile in flight over sea. Tenerife, Canary Islands.

Sergio Hanquet / Yellow-legged gull (Larus michahellis) group in flight and resting on sea. Tenerife, Canary Islands.

Sergio Hanquet / Yellow-legged gull (Larus michahellis), two standing on rock. Tenerife, Canary Islands.

Terry Whittaker / Man being lowered down cliff to collect seabird eggs including those of Common murre/ guillemot (Uria aalge) and Black-legged kittiwake (Rissa tridactyla). Gannet (Morus bassanus) colony on opposite c...

Dong Lei / Pallas's gull (Larus ichthyaetus) in snow at water's edge. Sanjiangyuan National Nature Reserve, Qinghai Province, Qinghai-Tibet Plateau. August.

Terry Whittaker / Man being lowered down cliff to collect seabird eggs including those of Black-legged kittiwake (Rissa tridactyla). Skoruvikurbjarg cliffs, Langanes Peninsula, Iceland. May 2018.

Terry Whittaker / Man harvesting eggs in Black-legged kittiwake (Rissa tridactyla) colony, on steep cliff face. Skoruvikurbjarg cliffs, Langanes Peninsula, Iceland. May 2018.

Terry Whittaker / Man being lowered down cliff to collect seabird eggs including those of Black-legged kittiwake (Rissa tridactyla) and Common murre / guillemot (Uria aalge). Skoruvikurbjarg cliffs, Langanes Peninsula,...

Terry Whittaker / Common murre / guillemot (Uria aalge) and Black-legged kittiwake (Rissa tridactyla) eggs in box and egg boxes. Collected from Skoruvikurbjarg cliffs, Langanes Peninsula, Iceland. May 2018.

Terry Whittaker / Common murre / guillemot (Uria aalge), Black-legged kittiwake (Rissa tridactyla) and Gull (Larus sp) eggs for sale at Reykjavik Weekend Market, Iceland. 2018.

Terry Whittaker / Common murre / guillemot (Uria aalge), Black-legged kittiwake (Rissa tridactyla) and Gull (Larus sp) eggs for sale at Reykjavik Weekend Market, Iceland. 2018.

Terry Whittaker / Common murre / guillemot (Uria aalge), Black-legged kittiwake (Rissa tridactyla) and Gull (Larus sp) eggs for sale at Reykjavik Weekend Market, Iceland. 2018.

JIM CLARE / Peruvian band-tailed gull, (Larus belcheri) chicks. Punta San Juan, (Reserva Nacional de Islas, Islotes y Puntas Guaneras) Peru.

JIM CLARE / Peruvian band-tailed gull, (Larus belcheri) chicks. Punta San Juan, (Reserva Nacional de Islas, Islotes y Puntas Guaneras) Peru.

Ernie Janes / Herring gull (Larus argentatus) immature bird feeding on hamburger debris in plastic wrapper, Norfolk, England, UK, February.

Tony Heald / Ivory gull (Pagophila eburnea) Svalbard, Norway, July.

Robin Chittenden / Glaucous gull (Larus hyperboreus) Norfolk, England, UK, February.

Robin Chittenden / Glaucous gull (Larus hyperboreus) Norfolk, England, UK. February.

John Chan / Western gulls (Larus occidentalis) preening on a beach, Southern California, USA.

Gabriel Rojo / Aerial shot of an Orca (Orcinus orca) and calf swimming quickly, hunting, followed by gulls (Larus), Peninsula Valdez, Patagonia Argentina.

John Shaw / Swallowtail gull (Creagrus furcatus) flying with pebble in its beak, Genovesa Island, Galapagos, May.

SCOTLAND: The Big Picture / Glaucous gull, (Larus hyperboreus), 2nd winter, chasing hooded crow from carcass, Scotland, UK.February

John Chan / Western gulls (Larus occidentalis) attacking an Elegant tern (Thalasseus elegans) with a broken wing, attempts to take flight, Southern California, USA, April.

Espen Bergersen / Aerial shot of a fishing boat catching Atlantic herring (Clupea harenguis), with Killer whales (Orcinus orca) and Humpback whales (Megaptera novaeangliae) swimming around the boat and large numbers of...

Espen Bergersen / Aerial shot of a fishing boat catching Atlantic herring (Clupea harenguis), with Killer whales (Orcinus orca) swimming around the boat and large numbers of gulls (Larus) flying overhead, Troms, Norway...

Espen Bergersen / Aerial shot of a fishing boat catching Atlantic herring (Clupea harenguis), with Killer whales (Orcinus orca) swimming around the boat and large numbers of gulls (Larus) flying overhead, Troms, Norway...

Espen Bergersen / Aerial shot of a fishing boats catching Atlantic herring (Clupea harenguis), with Killer whales (Orcinus orca) and Humpback whales (Megaptera novaeangliae) swimming around the boats and large numbers...

Espen Bergersen / Aerial shot of a flock of gulls (Larus) inside a fishing net full of Atlantic herring (Clupea harengus), Troms, Norway, December.

Espen Bergersen / Aerial shot of Killer whales (Orcinus orca) feeding, with gulls (Larus) following overhead, Troms, Norway, October.

Espen Bergersen / Aerial shot of Killer whales (Orcinus orca) feeding, with gulls (Larus) following overhead, Troms, Norway, October.

Espen Bergersen / Aerial shot of a pod of Killer whales (Orcinus orca) carousel feeding, Skjervoy, Troms, Norway, November.

Terry Whittaker / Kittiwake turning egg (Rissa tridactyla). Snaefellsness Peninsula, Iceland.

Terry Whittaker / Kittiwake (Rissa tridactyla) carrying nesting material, Skoruvikurbjarg cliffs, Langanes Peninsula. Northeast Iceland. May.

Terry Whittaker / Kittiwake (Rissa tridactyla) carrying nesting material, Skoruvikurbjarg cliffs, Langanes Peninsula. Northeast Iceland. May.

Terry Whittaker / Kittiwake (Rissa tridactyla) carrying nesting material, Skoruvikurbjarg cliffs, Langanes Peninsula. Northeast Iceland. May.

Terry Whittaker / Kittiwakes (Rissa tridactyla) Snaefellsness Peninsula, Iceland. May.

Marie Read / California Gull (Larus californicus), foraging for alkali flies (Ephydra hians) by running through swarm snapping its bill, on the shore at Mono Lake, California, USA. Digital frame expansion.

Nick Upton / Black-headed gulls (Chroicocephalus ridibundus), Common gull (Larus canus) and Lesser black-backed gulls (Larus fuscus) resting on a frozen lake, Wiltshire, UK, February.

Suzi Eszterhas / Isabel Luevano, Rehabilitation Technician, removing fishing line and hook from entangled Western gull (Larus occidentalis) nternational Bird Rescue, Fairfield, California. Captive - rescued and in re...

John Chan / Western gulls (Larus occidentalis) attacking an Elegant tern (Thalasseus elegans) with a broken wing, attempts to take flight, Southern California, USA, April.

John Chan / Elegant terns (Thalasseus elegans) gathering at breeding grounds, taking flight due to a nearby Western gull (Larus occidentalis), Southern California, USA, March.

John Chan / Western gull (Larus occidentalis) feeding on a California two-spot octopus (Octopus bimaculoides) on a mudflat at low tide, Southern California, USA, November.

John Chan / Western gulls (Larus occidentalis) roosting on a mudflat, with Dowitchers (Scolopacidae) foraging nearby, Southern California, USA, April.

John Chan / Pair of Western gulls (Larus occidentalis) courting, vocalising, Southern California, USA, April.

John Chan / Western gull (Larus occidentalis) preening, Southern California, USA, April.

Stefan Christmann / Kelp gull (Larus dominicanus) in flight. Atka Bay, Antarctica. January.

Sven Zacek / Herring gull (Larus argentatus) flock flying off coast of Saaremaa Island. Vilsandi National Park, Saaremaa, Western Estonia. November.

Nick Upton / Adult Herring gull (Larus argentatus) flying low over sandy beach, near St. Ives, Cornwall, UK, April.

Nick Hawkins / Swallow-tailed gull (Creagrus furcatus) perched on volcanic rock. San Cristobal Island, Galapagos.

Pal Hermansen / Black-legged kittiwake (Rissa tridactyla), two fighting on snow. Finnmark, Norway. March.

Pal Hermansen / Black-legged kittiwake (Rissa tridactyla), group on ledge of old house. Vardo, Finnmark, Norway. March.