Jack Dykinga / Yellow-headed blackbird (Xanthocephalus xanthocephalus) murmurations as flock returns to roost at sunset, Whitewater Draw Preserve, Arizona, USA.

Mateusz Piesiak / Black-headed Gull (Chroicocephalus ridibundus) flock in flight a dawn, Barycz Valley Landscape Park, Poland. Emotion'Ailes Photography Competition 2021 Category Winner - Artistic.

Bruno D'Amicis / Wild Apennine wolf (Canis lupus italicus) running in snow on mountain ridge. Central Apennines, Abruzzo, Italy. December.

Bruno D'Amicis / Wild Apennine wolf (Canis lupus italicus) running in snow on mountain ridge. Central Apennines, Abruzzo, Italy. December.

Klein & Hubert / Male Cheetah (Acinonyx jubatus) sitting in high grass in shade of acacia tree in savanna, Kenya, Africa.

David Noton / Dog walker on Vartenham Hill on a frosty New Year's Day, Milborne Port, Somerset, England. January 2021.

Ben Cranke / King penguins (Aptenodytes patagonicus) walking to the breeding colony. Fortuna Bay, South Georgia Island

Nick Garbutt / Adult humpback whale (Megaptera novaeangliae) diving in deep water channel. Great Bear Rainforest, British Columbia, Canada. COP26 Countdown Photo Competition 2021 Finalist. (digitally stitched image)

Denis-Huot / Aerial view of African elephants (Loxodonta africana) drinking and landscape, Samburu Game Reserve, Kenya

Mateusz Piesiak / Eurasian wolf (Canis lupus lupus) pack in snow, forest in Bialowieza National Park. Poland. January 2019. Received Honour award at the Mont Photo 2020 Competition.

Edwin Giesbers / Orange tip butterfly (Anthocharis cardamines), two females on Cuckooflower (Cardamine pratensis) in marshy grassland, egg visible on stem. April 2009.

Guy Edwardes / Dalmatian Pelican (Pelecanus crispus) landing on Lake Kerkini, Greece

Staffan Widstrand / Black-capped Night heron (Nycticorax nycticorax) feeding on fish at fish farm pond, Pusztaszer protected landscape, Kiskunsagi, Hungary, May

Staffan Widstrand / Great white egret (Egretta / Ardea alba) Pusztaszer protected landscape, Kiskunsagi, Hungary, May

Staffan Widstrand / Eurasian Hoopoe, (Upupa epops) coming out of burrow. Pusztaszer protected landscape, Kiskunsagi, Hungary, May

Juergen Freund / Firefly (Lampyridae) trails on beach at night, Palm tree silhouetted against milky way. Oak Beach, Port Douglas, Far North Queensland, Australia. 2016.

Danny Green / Bison (Bison bison) in snow, at woodland edge with frost covered trees. Yellowstone National Park, USA, January 2020.

Jack Dykinga / Yellow-headed blackbird (Xanthocephalus xanthocephalus) flock murmuration as they take off from the marsh at dawn, Whitewater Draw, Arizona State Game and Fish Reserve, USA. January.

Erlend Haarberg / Reindeer herders on snowmobiles, moving a large flock of semi-domesticated Reindeer (Rangifer tarandus), to the reindeer calving areas in the Jotunheimen National Park, Norway. April.

John Shaw / Osprey (Pandion haliaetus) landing at its nest in a Bald cypress tree (Taxodium distichum) draped with epiphytic Spanish moss (Tillandsia usneoides). Blue Cypress Lake, Florida, USA. April.

Tui De Roy / Wolf giant tortoise (Chelonoidis becki) in habitat. Hybrids of mixed parentage with different shell shapes are scattered far and wide on the rugged west slope of Wolf Volcano. Wolf Volcano, Isabela Is...

Orsolya Haarberg / Reindeer herders moving a large flock of semi-domesticated Reindeer (Rangifer tarandus), with the help of snowmobiles, to the reindeer calving areas in the Jotunheimen National Park, Norway. Here, the...

Erlend Haarberg / Reindeer herders moving a large flock of semi-domesticated Reindeer (Rangifer tarandus), with the help of snowmobiles, to the reindeer calving areas in the Jotunheimen National Park, Norway. April 202...

Erlend Haarberg / Reindeer herders moving a large flock of semi-domesticated Reindeer (Rangifer tarandus), with the help of snowmobiles, to the reindeer calving areas in the Jotunheimen National Park, Norway. April 202...

Erlend Haarberg / Reindeer herders moving a large flock of semi-domesticated Reindeer (Rangifer tarandus) with the help of snowmobiles, to the reindeer calving areas in the Jotunheimen National Park, Norway. Mt Semmelh...

Alex Mustard / A vibrant Caribbean coral reef with two Reef sharks (Carcharhinus perezi) and Common sea fans (Gorgonia ventalina) and sea plumes (Pseudopterogorgia sp). Jardines de la Reina, Gardens of the Queen Nat...

Danny Green / Starling murmuration, hundreds of thousands of starlings (Sturnus vulgaris) gather in the skies near their night time roost. Gretna Green, Scotland, January. Black and White Category Winner, Wildlife...

Stefan Christmann / Emperor penguins (Aptenodytes fosteri) colony at night with Aurora Australis, Antarctica.

Laurent Geslin / Red fox (Vulpes vulpes) at edge of woodland in winter snow, Jura, Switzerland

Erlend Haarberg / Arctic fox (Vulpes lagopus), Dovrefjell-Sunndalsfjella National Park, Norway, April.

Erlend Haarberg / Svalbard reindeer (Rangifer tarandus platyrhynchus), Svalbard, Norway, September.

Erlend Haarberg / Rock ptarmigan (Lagopus muta) in flight, Tysfjorden, Nordland, Norway, March.

Erlend Haarberg / Muskox (Ovibus moschatos) males, Dovrefjell-Sunndalsfjella National Park, Norway, February.

Guy Edwardes / Dawn over Mogshade Hill, New Forest National Park, Hampshire, England, UK

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

Nick Garbutt / RF - Red fox (Vulpes vulpes) foraging in snow covered valley. Hayden Valley, Yellowstone National Park, USA. February 2019. (This image may be licensed either as rights managed or royalty free.)

Danny Green / Polar bear (Ursus maritimus) two walking in snowy landscape with glacier behind. Svalbard, Norway, April 2018.

Danny Green / Polar bear (Ursus maritimus) male female pair looking upwards, snow covered hills in background. Svalbard, Norway, April 2018.

Danny Green / Polar bear (Ursus maritimus) and cubs feeding on Whale carcass, on iceberg. Svalbard, Norway, July 2018.

Danny Green / Polar bear (Ursus maritimus) walking across ice, snow covered mountain in background. Svalbard, Norway, April 2018.

Danny Green / Polar bear (Ursus maritimus) standing on glacier. Svalbard, Norway, July 2018.

Danny Green / Polar bear (Ursus maritimus) male standing beside rocks in frozen and snow covered landscape. Svalbard, Norway, April 2019.

Danny Green / Polar bear (Ursus maritimus) male walking across frozen landscape. Svalbard, Norway, April 2019.

Danny Green / Polar bear (Ursus maritimus), male and female approaching each other across snow covered rocky landscape. Svalbard, Norway, April 2019.

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

Danny Green / Arctic fox (Vulpes lagopus), two in snow covered landscape. Svalbard, Norway, April 2019.