Roger Powell / Lesser black-backed gull (Larus fuscus) on cliff with Little Skellig gannetry in the background, Great Skellig island, Co Kerry, Republic of Ireland, June 2011

Wild Wonders of Europe / Bartocha / Lesser black backed gulls (Larus fuscus) and Herring gulls (Larus argentatus) perched on posts in the Baltic Sea silhouetted at sunset, Mn, Denmark, July 2009

Wild Wonders of Europe / Bartocha / Lesser black backed gulls (Larus fuscus) and Herring gulls (Larus argentatus) perched on posts in the Baltic Sea silhouetted at dusk, Mn, Denmark, July 2009

Graham Eaton / Lesser Black-backed Gull (Larus fuscus) catching a large fish, Cardigan Bay, Wales, UK, May

Graham Eaton / Lesser Black-backed Gull (Larus fuscus) about to land on the sea, Cardigan Bay, Wales, UK, May

Nick Upton / Lesser black backed gull (Larus fuscus) nesting on rooftop chimneypot, Edinburgh, Scotland, UK, June.

Rob Jordan / 2020VISION / Lesser black-back gulls (Larus fuscus) stealing fish from resistant Puffin (Fratercula arctica) returning to nest burrow on Staple Island, Farne Islands, Northumberland, June 2010.

Nick Upton / Looking down on a Lesser black-backed gull (Larus fuscus) bathing in the River Avon on the edge of Pulteney weir, Bath, Somerset, UK, April.

Nick Upton / Lesser black-backed gull (Larus fuscus) on freshwater pond, Victoria park, Bath, Somerset, UK, April.

Nick Upton / 2020VISION / Lesser black-backed gull (Larus fuscus) flying up from pond with eyes fixed on some bread thrown by a tourist, Victoria park, Bath, UK, June.

Terry Whittaker / 2020VISION / Lesser black-backed gulls (Larus fuscus), Herring gulls (Larus argentatus) and Black-headed gulls (Larus ridibundus) feeding on landfill site, Pitsea, Essex, England, UK, November 2011

Bert Willaert / Lesser Black-backed Gull (Larus fuscus). Belgium, August.

Alan Williams / Lesser black backed gull (Larus fuscus) calling while landing on territory, Puffin Island, Anglesey, North Wales, UK, June

Alan Williams / Lesser black backed gull (Larus fuscus) in flight towards intruder, calling, Puffin Island, Anglesey, North Wales, UK, June

Alan Williams / Lesser black backed gull (Larus fuscus) in flight, Puffin Island, Anglesey, North Wales, UK, June

Andrew Parkinson / Lesser black backed gull (Larus fuscus) adult 'long-calling' from an elevated rock, Skomer Island, Wales, UK, May.

Andrew Parkinson / Lesser black backed gull (Larus fuscus) adult 'long-calling' from an elevated rock, May, Skomer Island, Wales, UK, May.

Robert Thompson / Lesser black-backed gull (Larus fuscus) perched on rock, Saltee Island, County Wexford, Republic of Ireland, June

Ernie Janes / Lesser black backed gull (Larus fuscus) feeding on eel on mudlfats, UK

Robert Thompson / Lesser Black Backed gull (Larus fuscus) perched on a rock. Great Saltee Island, Kilmore Quay, County Wexford, Republic of Ireland, June.

Robert Thompson / Two Lesser Black-backed gulls (Larus fuscus) chicks on a rock. Great Saltee Island, Kilmore Quay, County Wexford, Republic of Ireland, June.

Mike Potts / Lesser Black Backed Gull (Larus fuscus) in flight, Anglesey coast, North Wales, UK, June

John Waters / Lesser Black-backed Gulls (Larus fuscus) breeding pair resting on roof of building, Somerset, England, UK, April 2010.

Hanne & Jens Eriksen / Lesser black backed gull {Larus fuscus graellsii} looking over shoulder, Iceland, June

Robin Chittenden / Lesser Black-backed gull (Larus fuscus) in flight over water, Norfolk, UK. adult first winter plumage.

Robin Chittenden / Lesser black-backed gull (Larus fuscus graellsii) in flight over water, Norfolk, UK, adult, winter plumage.

Graham Eaton / Lesser Black-backed Gull (Larus fuscus) portrait, Anglesey, UK

Wild Wonders of Europe / Peltomäki / Lesser black backed gull (Larus fuscus) in flight, Texel, Netherlands, May 2009

Adrian Davies / Lesser black-backed gull {Larus fuscus} on nest amongst Thrift (Armeria maritima), South Stack, Anglesey, Wales, UK

Adrian Davies / Lesser black-backed gull {Larus fuscus} on nest amongst Thrift (Armeria maritima) South Stack, Anglesey, Wales, UK

Adrian Davies / Lesser black-backed gull {Larus fuscus} South Stack, Anglesey, Wales, UK

Adrian Davies / Lesser black-backed gull {Larus fuscus} nest with three eggs, South Stack, Anglesey, Wales, UK

Adrian Davies / Lesser black-backed gull {Larus fuscus} nest with two eggs, South Stack, Anglesey, Wales, UK

Mike Potts / Lesser black backed gull (Larus fuscus) on water, off the South coast of Anglesey, North Wales, UK

Mike Potts / Lesser black backed gull (Larus fuscus) on water, off the South coast of Anglesey, North Wales, UK

Mike Potts / Lesser black backed gull (Larus fuscus) calling on the water, off the South coast of Anglesey, North Wales, UK

Mike Potts / Lesser black backed gull (Larus fuscus) with fledged youngster begging for food, off the South coast of Anglesey, North Wales, UK

Tim Martin / Lesser Black-backed Gulls (Larus fuscus), pair courting on top of sea cliff. Skomer Island, Pembrokeshire Coast National Park, West Wales, UK. April

Tim Martin / Lesser black-backed gull (Larus fuscus) calling on top of sea cliff. Skomer Island, Pembrokeshire Coast National Park, West Wales, UK. April

Tim Martin / Lesser Black-backed Gull (Larus fuscus) on top of sea cliff. Skomer Island, Pembrokeshire Coast National Park, West Wales, UK. April

Tim Martin / Lesser Black-backed Gull (Larus fuscus). Skomer Island, Pembrokeshire Coast National Park, West Wales, UK. April

Bruno D'Amicis / Lesser Black-backed gulls (Larus fuscus) roosting on sand shore, Atlantic coast of Southern Morocco, NW Africa

Jason Smalley / Lesser Black backed gull {Larus fuscus} perched, UK

Graham Eaton / Lesser Black-backed Gull (Larus fuscus) flying over the sea searching for food, Cardigan Bay, Wales, UK, May

Graham Eaton / Lesser Black-backed Gull (Larus fuscus) walking along top of a wall, South Stack, Wales, UK, April

Graham Eaton / Lesser Black-backed Gull (Larus fuscus) flying, Wales, UK

Graham Eaton / Lesser Black-backed Gull (Larus fuscus) flying, about to land on the sea, Cardigan Bay, Wales, UK, May

Graham Eaton / Lesser Black-backed Gull (Larus fuscus) flying over sea with fish in its beak, Cardigan Bay, Wales, UK, May

Graham Eaton / Lesser Black-backed Gull (Larus fuscus) flying over sea with fish in its beak, Cardigan Bay, Wales, UK, May

Bernard Castelein / Lesser black-backed gull (Larus fuscus), Helgoland, Germany

David Kjaer / Lesser Black-backed Gull (Larus fuscus) in flight, Poland

Bernard Castelein / Lesser Black-backed Gull (Larus fuscus) flying, Belgium

Bernard Castelein / Lesser Black-backed Gull (Larus fuscus) flying and calling, Belgium

Paul Hobson / Lesser black-backed gull (Larus fuscus) swallowing a puffin chick, Farnes, uk

Philippe Clement / Lesser black backed gull in flight (Larus fuscus), Texel, Netherlands

Pete Oxford / Portrait of Lesser black backed gull (Larus fuscus), Isle of May, Scotland, UK

DAVID TIPLING / Lesser black backed gull (Larus fuscus) calling, Scotland, UK

George McCarthy / Lesser black backed gull (Larus fuscus) standing on rock calling, Scotland, UK

George McCarthy / Lesser black backed gull (Larus fuscus) standing on rock calling, Scotland, UK

Tim Edwards / Lesser black backed gull nest with three eggs {Larus fuscus} Skomer Is NR, Pembrokeshire, Wales, UK.

Nigel Bean / Lesser black backed gull {Larus fuscus} Wales, UK

SIMON KING / Lesser black backed gull flying (Larus fuscus) England, UK

George McCarthy / Lesser black backed gull calling {Larus fuscus} Scotland, UK

Niall Benvie / Lesser black backed gull on sign post, Scotland

Staffan Widstrand / Lesser black-backed gull {Larus fuscus} flying, Gotland, Sweden.

Philippe Clement / Lesser black backed gull {Larus fuscus} Belgium

Philippe Clement / Lesser black backed gull portrait {Larus fuscus} Belgium

Philippe Clement / Lesser black backed gull chicks {Larus fuscus} Belgium

Philippe Clement / Lesser black backed gull feeding chicks {Larus fuscus} Belgium

Philippe Clement / Lesser black backed gull chick {Larus fuscus} Belgium

Philippe Clement / Lesser black backed gull feeding chicks {Larus fuscus} Belgium

Philippe Clement / Lesser black backed gull feeding chicks {Larus fuscus} Belgium

Barrie Britton / Lesser black backed gull with chicks on rooftop, Bristol, England

David Kjaer / Lesser black backed gull calling {Larus fuscus} Scotland

Brian Lightfoot / Lesser black backed gull with chicks {Larus fuscus} May Is, Scotland, UK

Barrie Britton / Lesser black backed gull nesting on rooftop, Bristol, England

Pete Oxford / Lesser black backed gull, Isle of May, Scotland, UK.

Nigel Bean / Lesser black backed gull calling {Larus fuscus} Anglesey, Wales, UK South Stack

David Kjaer / Lesser Black Backed gull calling, Scotland

SIMON KING / Lesser black backed gull in flight (Larus fuscus)

Brian Lightfoot / Lesser black backed gull chick hatching from egg {Larus fuscus} May Is, Scotland, UK

Tim Edwards / Close up of Lesser black backed gull feathers {Larus fuscus} UK

Mike Read / Lesser black backed gull (Larus fuscus) preening on cliff top, Isle of May, Firth of Forth, Scotland, June

Peter Lewis / Lesser black backed gull (Larus fuscus) on rock. Isle of May, Scotland.

Peter Lewis / Lesser Black Backed Gull (Larus fuscus) on rock. Isle of May, Scotland.

Peter Lewis / Lesser black backed gull (Larus fuscus) profile, Isle of May, Scotland.

John Cancalosi / Lesser black backed gull + chicks {Larus fuscus} UK

Brian Lightfoot / Lesser black backed gull chicks in nest {Larus fuscus} May Is Scotland UK

John Cancalosi / Lesser black backed gull {Larus fuscus} UK

John Cancalosi / Lesser black backed gull with chicks {Larus fuscus} UK