Ismaele Tortella / Northern gannet (Morus bassanus) colony, chick climbing back into nest, with the midnight sun, Norway, July

Ismaele Tortella / Three Rock ptarmigan (Lagopus muta) feeding in winter plumage, city of Tromso in the background, northern Norway, March 2019.

Ismaele Tortella / White tailed eagle (Haliaeetus albicilla) catching fish, Lofoten, Norway, August.

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

Ismaele Tortella / Tracking shot of a Whooper swan (Cygnus cygnus) family walking, Lofoten, northern Norway, August.

Hermann Brehm / Cuckoo (Cuculus canorus) in flight, Germany, April. May

Andy Rouse / Little Bittern (Ixobrychus minutus) hunting in reeds, Bulgaria. Horizontal version of 01609394. Highly honoured in the Bird Category of the Nature's Best Photography Competition 2019.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) two adults brooding chicks age 5 weeks, Antarctica. Highly commended in the Polar Passion Category of the Nature's Best Photography Awards 2019.

Pal Hermansen / Close up of Goshawk (Accipiter gentilis) feathers, with one foot held up, Trondelag, Norway. Winner of the Attention to Detail Category of the Bird Photographer Competition 2019.

Chase Dekker / Lesser Flamingo (Phoenicopterus minor) wading, Amboseli National Park, Kenya

Chase Dekker / Lesser Flamingo (Phoenicopterus minor) pair fighting, Amboseli National Park, Kenya

Winfried Wisniewski / White Stork (Ciconia ciconia) on nest, Extremadura, Spain

Jami Tarris / Golden Eagle (Aquila chrysaetos) huntress, Altai Mountains, Bayan Ulgii, Mongolia

Richard Du Toit / Greater Double-collared Sunbird (Nectarinia afra) male on Pincushion (Leucospermum sp) flower, Western Cape, South Africa

Heike Odermatt / Brunnich's Guillemot (Uria lomvia) nesting colony on cliff, Alkefjellet, Hinlopen Strait, Svalbard, Norway

Martin Willis / Victoria's Riflebird (Ptiloris victoriae) male in courtship display, Atherton Tableland, Queensland, Australia. Sequence 2 of 3

Martin Willis / Splendid Fairywren (Malurus splendens) female and male, Queensland, Australia

Martin Willis / Red-collared Lorikeet (Trichoglossus rubritorquis) feeding on flower nectar, Kimberley, Western Australia, Australia

Martin Willis / Rainbow Lorikeet (Trichoglossus haematodus) pair preening during courtship, Magnetic Island, Queensland, Australia

Martin Willis / Budgerigar (Melopsittacus undulatus) father with begging chick at nest cavity, Queensland, Australia

Danny Green / Brunnich's guillemot (Uria lomvia) colony in mist, many birds in flight and nesting on cliffs. Svalbard, Norway, July 2018.

Phil Savoie / Blue tit (Cyanistes caeruleus) bringing Crab spider (Misumena vatia) prey to nest, Monmouthshire Wales, UK, May.

Nick Garbutt / Black-browed albatross (Thalassarche melanophris) flying over South Atlantic. Cooper Bay, South Georgia. November.

Nick Garbutt / King penguin (Aptenodytes patagonicus), two sleeping on snow. Grytviken, South Georgia. March.

Ann & Steve Toon / Ostrich (Struthio camelus) silhouetted in dust storm. Kalahari Gemsbok National Park, Kgalagadi Transfrontier National Park, Northern Cape, South Africa.

Andres M. Dominguez / Hawfinch (Coccothraustes coccothraustes) perched on branch amongst Hawthorn (Crataegus sp) berries. Sierra de Grazalema Natural Park, Cadiz, Spain. February.

Oscar Dewhurst / Mute swan (Cygnus olor), two cygnets sheltering under parent's wing. Richmond Park, London, England, UK. April.

Oscar Dewhurst / Mute swan (Cygnus olor) swimming with cygnets in misty lake in morning light. Richmond Park, London, England, UK. May.

Guy Edwardes / Barn owl (Tyto alba) in flight above post and wildflowers, in morning light. The Hawk Conservancy Trust, Hampshire, England, UK. July. Captive.

Guy Edwardes / Dalmatian pelican (Pelecanus crispus), portrait. Lake Kerkini, Sintik, Greece. January.

Claudio Contreras / California condor (Gymnogyps californianus), portrait. California condor recovery program, Sierra de San Pedro Martir National Park, Baja California Peninsula, Mexico.

Claudio Contreras / California condor (Gymnogyps californianus), two perched in tree, adult and juvenile. California condor recovery program, Sierra de San Pedro Martir National Park, Baja California Peninsula, Mexico.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) colony huddled together under the Southern Lights, Aurora australis, Atka Bay, Antarctica. September.

Jack Dykinga / Burrowing owl (Athene cunicularia) female and ten chicks aged a few weeks. Marana, Arizona, USA. May.

Jack Dykinga / Greater roadrunner (Geococcyx californianus) running to feed brood with Lizard prey in beak. Catalina State Park, Sonoran Desert, Arizona, USA. June.

Sven Zacek / Ural owl (Strix uralensis) perched in tree sleeping, viewed through a fence, Estonia.

Gary Bell/ Oceanwide / Australian Pelican (Pelecanus conspicillatus) flock, New South Wales, Australia

Doug Gimesy / Little blue penguin (Eudyptula minor), two standing on rocks at night, silhouetted against Melbourne city lights. St Kilda breakwater, Victoria, Australia. December 2016.

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

Doug Gimesy / Little penguin (Eudyptula minor) on rocks of St Kilda breakwater, Melbourne city lights in background. Victoria, Australia. January 2017.

George Sanker / Great egret (Ardea alba) with prey in beak, in evening light. Myakka River State Park, Florida, USA, March. Sequence 2/2.

George Sanker / Great egret (Ardea alba) diving head into water to catch prey, in evening light. Myakka River State Park, Florida, USA, March. Sequence 1/2.

David Woodfall / Hedge which has been 'netted ' to prevent breeding birds nesting, which would delay building development of new homes. The tree in the background has also been cut back. Chester, Cheshire, Eng...

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) egg hatching on father's feet. Atka Bay, Antarctica. August. Winner of the Portfolio category of the Wildlife Photographer of the Year Awards 2019.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) chick looking upwards to parents beak. Atka Bay, Antarctica. August. Winner of the Portfolio category of the Wildlife Photographer of the Year Awards 2019.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) colony, males huddling whilst incubating eggs. Atka Bay, Antarctica. July. Winner of the Portfolio category of the Wildlife Photographer of the Year Awards 2019.

Staffan Widstrand / RF - Pied kingfisher (Ceryle rudis) group of three perched on branch, squabbling, Zimanga Private Nature Reserve, KwaZulu Natal, South Africa

Staffan Widstrand / African Spoonbill (Platalea alba) preening, Zimanga Private Nature Reserve, KwaZulu Natal, South Africa

Staffan Widstrand / Tawny eagle (Aquila rapax) in flight, Zimanga Private Nature Reserve, KwaZulu Natal, South Africa

Ismaele Tortella / Rock ptarmigan (Lagopus muta) feeding in winter plumage, city of Tromso in the background, northern Norway, March 2019.

Ismaele Tortella / White tailed eagle (Haliaeetus albicilla) flying, Lofoten, Norway, August.

Morley Read / Common potoo (Nyctibeus griseus) camouflaged on nest on a dead tree stump, Amazon rainforest, Orellana Province, Ecuador.

Morley Read / Common potoo (Nyctibeus griseus) camouflaged on nest on a dead tree stump, Amazon rainforest, Orellana Province, Ecuador.

Espen Bergersen / Northern fulmar (Fulmarus glacialis) in front of the Seljalandsfoss waterfall, Iceland. May

Espen Bergersen / Northern fulmars (Fulmarus glacialis) in flight over river, Iceland, May.

Espen Bergersen / Ruddy turnstone (Arenaria interpres) in water, Iceland

Espen Bergersen / Common Loon (Gavia immer) flapping wings in water, Iceland, May.

Espen Bergersen / Harlequin duck (Histrionicus histrionicus) male holding female under water as part of copulation. Iceland

Espen Bergersen / Pair of Harlequin duck (Histrionicus histrionicus) in river stream. Myvatn, Iceland.

Espen Bergersen / Harlequin duck (Histrionicus histrionicus) in river stream. Myvatn, Iceland. May.

Espen Bergersen / Barrow's goldeneye (Bucephala islandica) in partly frozen lake. Iceland, May.

Espen Bergersen / Whooper swan (Cygnus cygnus). Iceland

Espen Bergersen / Harlequin duck (Histrionicus histrionicus) Jokulsarlon lake. Iceland 2016

Espen Bergersen / Common eider (Somateria mollissima) swimming in the Jokulsarlon lake. Iceland, May.

Espen Bergersen / Common eider (Somateria mollissima) resting on ice. Iceland, May.

Espen Bergersen / Common eider (Somateria mollissima) performing courtship postures between ice bergs in the Jokulsarlon Lake, Iceland. May.

Espen Bergersen / Common eider (Somateria mollissima) between ice bergs in the Jokulsarlon lake. Iceland, May.

Espen Bergersen / Pair of Harlequin duck (Histrionicus histrionicus) Jokulsarlon lake. Iceland. May.

Espen Bergersen / Harlequin duck (Histrionicus histrionicus) male, Iceland

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

Espen Bergersen / Gull and waves on Reynisfjara, Black Sand Beach, Iceland. May.

Espen Bergersen / Gull on black beach with waves on Reynisfjara Black Sand Beach. Iceland. May.

Espen Bergersen / Arctic terns (Sterna paradisaea) figting above the Reynisdrangar rock formation, Iceland

Hermann Brehm / Sparrowhawk (Accipiter nisus) male, Germany. December

Hermann Brehm / Coal Tit (Parus ater) with food for the chicks, Germany. April

Hermann Brehm / Coal Tit (Parus ater) by pond, Germany. April

Hermann Brehm / Great spotted woodpecker (Dendrocopos major) left, and Middle spotted woodpecker (Dendrocoptes medius) right, on tree trunk, Germany. March

Doug Gimesy / Jacky Hunt, specialist in bird rescue and rehabilitation, with two Boobook owls (Ninox boobook), which she is providing temporary accommodation for in her factory. These birds were evacuated from the...

Doug Gimesy / Jacky Hunt, a specialist in bird rescue and rehabilitation, with two Boobook owls (Ninox boobook), which she is providing temporary accommodation for in her factory. These birds were evacuated from th...

Hermann Brehm / Cuckoo (Cuculus canorus) in flight, Germany. April.

Hermann Brehm / Great spotted woodpecker (Dendrocopos major) right, and Middle spotted woodpecker (Dendrocoptes medius) left, on tree trunk, Germany. April

Hermann Brehm / Grey-headed Woodpecker(Picus canus) male on tree trunk, Germany. January

Hermann Brehm / Sparrowhawk (Accipiter nisus) male, perched, Germany. January

Hermann Brehm / Black Woodpecker (Dryocopus martius) male and female, at the nesthole, Germany. December

Hermann Brehm / Black Woodpecker (Dryocopus martius) male, calling, Germany. February

Hermann Brehm / Black Woodpecker (Dryocopus martius) male, Germany. November

Hermann Brehm / Coal Tit (Parus ater) with food for the chicks Germany. November

Hermann Brehm / Middle spotted Woodpecker (Dendrocopus medius) and Jay (Garrulus glandarius), Germany. October

Hermann Brehm / Great spotted woodpecker (Dendrocopos major) and Grey headed woodpecker (Picus canus) on tree trunk, Germany. December

Hermann Brehm / Middle Spotted Woodpecker (Dendrocopus medius) on tree stump, Germany. January

Hermann Brehm / Ibisbill (Ibidorhyncha stzrthersii) Ladakh, India. February

Hermann Brehm / Wryneck (Jynx torquilla) carrying prey to nest hole in tree trunk, Hungary. February

Hermann Brehm / Wryneck (Jynx torquilla) carrying prey to nest hole in tree trunk, Hungary. June

Hermann Brehm / Green woodpecker (Picus viridis) juvenile, Hungary. June

Hermann Brehm / Bee-eater (Merops apiaster) with dragonfly prey, Hungary. June

Hermann Brehm / Bee-eater (Merops apiaster) with dragonfly prey, Hungary. June