Ismaele Tortella / Four Eurasian elk (Alces alces) walking through vegetation , Norway, August

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

Morley Read / Lantern fly (Fulgora laternaria) walking along a branch in the rainforest, Orellana Province, Ecuador.

Morley Read / Millipede (Diplopoda) walking along a branch, Orellana Province, Ecuador.

Morley Read / Millipede (Diplopoda) walking along a branch, Orellana Province, Ecuador.

Morley Read / Slow motion clip of a Guacamayo plump toad (Osornophryne guacamayo) walking, Orellana Province, Ecuador.

Morley Read / Slow motion clip of a Leaf frog (Cruziohyla craspedopus) walking, Ecuador.

Morley Read / Slow motion clip of a Leaf frog (Cruziohyla craspedopus) turning around, Ecuador.

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

Danny Green / Polar bear (Ursus maritimus) looking for food on ice. Svalbard, Norway, April.

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

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

Danny Green / RF - Reindeer (Rangifer tarandus) walking up slope in snow. Svalbard, Norway, April. (This image may be licensed either as rights managed or royalty free.)

Danny Green / RF - Polar bear (Ursus maritimus) cub walking in snow. Svalbard, Norway, April. (This image may be licensed either as rights managed or royalty free.)

Danny Green / RF - Polar bear (Ursus maritimus) female walking across ice. Svalbard, Norway, April. (This image may be licensed either as rights managed or royalty free.)

Danny Green / Reindeer (Rangifer tarandus) walking in snow. Svalbard, Norway, April.

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

Danny Green / Arctic fox (Alopex lagopus) following scent, in winter pelage. Svalbard, Norway. April.

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.)

Ann & Steve Toon / Cheetah (Acinonyx jubatus) walking, silhouetted at dusk. Zimanga private game reserve, KwaZulu-Natal, South Africa.

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

Oscar Dewhurst / Fallow deer (Dama dama) walking across frost-covered playing fields at dawn, with tower blocks of London in the background. Richmond Park, London, UK. December

Jordi Chias / Gentoo penguins (Pygoscelis papua) walking in line, returning to nesting area, Port Charcot, Antarctic Peninsula, Antarctica.

Jordi Chias / Gentoo penguins (Pygoscelis papua) walking in line, returning to nesting area, Port Charcot, Antarctic Peninsula, Antarctica.

Jordi Chias / Gentoo penguins (Pygoscelis papua) walking in line, returning to nesting area, Port Charcot, Antarctic Peninsula, Antarctica.

Matthew Maran / Red fox (Vulpes vulpes) carrying a large dead Brown rat (Rattus norvegicus) in an urban garden, North London, UK. August.

Andy Rouse / Bengal Tiger, (Panthera tigris), walking, Ranthambhore, India

Andy Rouse / African Lion, (Panthera leo), female hunting, Masai Mara, Kenya, Africa,

Yashpal Rathore / Bengal tiger (Panthera tigris tigris) (T27) walking on bund / dam wall trail. Kanha National Park, Central India. Camera trap image.

Bernard Castelein / Rhesus macaque (Macaca mulatta), mixed group of female and juveniles, walking along a track, Keoladeo National Park, Bharatpur, India

Jami Tarris / African Elephant (Loxodonta africana) herd on savanna, Mount Kilimanjaro, Amboseli National Park, Kenya

Andy Rouse / African Leopard (Panthera pardus) female walking, Masai Mara, Kenya

Stefan Christmann / Emperor penguin (Aptenodytes forsteri), four journeying across sea ice to feed young. Atka Bay, Antarctica. August.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) group of brooding males amongst drifting snow. Atka Bay, Antarctica. August.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) males in breeding colony incubating eggs, huddling during winter storm. Penguins on outside repositioning themselves to gain protection from weather. Atka Bay, A...

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) walking across crack in sea ice during return to breeding colony. Atka Bay, Antarctica. April.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri), three in a row, walking through drifting snow to feed young. Atka Bay, Antarctica. September.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) group clambering up slope during journey to bring back food for young. Atka Bay, Antarctica. September.

Daniel Heuclin / Andean fox (Lycalopex culpaeus) walking in the Altiplano, Andes, Bolivia. September 2018.

Paul Hobson / Badger (Meles meles) crossing road in residential area at night. Sheffield, England, UK. October 2018.

SCOTLAND: The Big Picture / Pine marten (Martes martes) foraging in Pine (Pinus sp) woodland at night. Glenfeshie, Cairngorms National Park, Scotland, UK.

SCOTLAND: The Big Picture / European badger (Meles meles) in front of house at night, Glenfeshie, Cairngorms National Park, Scotland, UK.

SCOTLAND: The Big Picture / Red deer (Cervus elaphus) stag in upland landscape. Lochcarron, Highlands, Scotland, UK.

Christophe Courteau / Mountain gorilla (Gorilla beringei beringei), silverback and juvenile son. Volcanoes National Park. Rwanda.

Axel Gomille / Wolf (Canis lupus) walking, Saxony-Anhalt, Germany

Andy Rouse / Bengal tiger (Panthera tigris) tigress Noor , Ranthambhore, India

Hermann Brehm / Snow Leopard (Panthera uncia) climbing steep rock face, Mongolia

Erlend Haarberg / Semi-domesticated reindeer (Rangifer tarandus) walking on snow-covered road in pine forest. Lapland, Sweden. February.

Nick Garbutt / Male American Bison (Bison bison) walking through snow. Firehole River Valley, Yellowstone National Park, Wyoming, USA. January

Juergen Freund / Hand-reared Boongary (Dendrolagus lumholtzi) descending from a tree and climbing onto its carer's back, Atherton Tablelands, Queensland, Australia.

Giri Cavale / Melanistic leopard / Black panther (Panthera pardus) Nagarahole National Park, Nilgiri Biosphere Reserve, Karnataka, India.

Valeriy Maleev / Snow leopard (Uncia uncia) Altai Mountains, Mongolia. March.

Valeriy Maleev / Pallas's cat (Otocolobus manul) walking in snow, Gobi Desert, Mongolia. December.

Valeriy Maleev / Amur leopard (Panthera pardus orientalis) walking in snow, Land of the Leopard National Park, Primorsky Krai, Far East Russia. February.

Sue Flood / Emperor penguin (Aptenodytes forsteri) walking with young chick at Snow Hill Island rookery, Antarctica. October.

Jeff Foott / Jaguar (Panthera onca) walking along river bank, Cuiaba River, Pantanal Matogrossense National Park, Pantanal, Brazil.

Guy Edwardes / Allen's / Lesser gallinule (Porphyrio alleni) walking on waterlilies, Chobe River, Botswana.

Guy Edwardes / Black crake (Amaurornis flavirostra) standing on lily pads, Chobe River, Botswana.

Guy Edwardes / Beech (Fagus sylvatica) avenue, Moor Crichel, Dorset, England, UK. May 2017.

Andy Rouse / Bengal tiger (Panthera tigris) male T57 walking in dusk light, Ranthambhore, India

Juergen & Christine Sohns / Black-footed Penguin (Spheniscus demersus) pair on beach, Betty's Bay, Stony Point Nature Reserve, South Africa

Edwin Giesbers / Giant panda (Ailuropoda melanoleuca) in snow, captive.

Kirkendall-Spring Photographers / Vicky Spring next to a small tarn, Lyman Lakes Basin, Glacier Peak Wilderness, Wenatchee National Forest, Washington, USA, September 2014. Model released.

John Waters / Close-up of a Coot (Fulica atra) walking on ice, Greylake RSPB Reserve, Somerset Levels, England, UK, February.

Bruno D'Amicis / Red fox (Vulpes vulpes) walking through snow. Central Apennines, Molise, Italy, February.

Bruno D'Amicis / Wild Apennine wolf (Canis lupus italicus) in snowy landscape. Central Apennines, Abruzzo, Italy. February. Italian endemic subspecies.

Staffan Widstrand / Wild Wonders of China / Tibetan wolf (Canis lupus) in snow, Keke Xili, Changtang, Tibetan Plateau, Qinghai, China

Staffan Widstrand / Wild Wonders of China / Pallas's cat (Otocolobus manul), Qinghai, China

Guy Edwardes / Snowy owl (Bubo scandiacus) walking on ground in snow, one foot raised, Ontario, Canada, January.

Konrad Wothe / Pair of Rosalia longicorns (Rosalia alpina) climbing up a Beech tree (Fagus sylvatica) whilst mating, Upper Bavaria, Germany, August.

Frederique Olivier / Wide-angle shot of a group of Emperor penguin (Aptenodytes forsteri) chicks walking on sea ice, Adelie Land, Antarctica, January.

Frederique Olivier / Emperor penguin (Aptenodytes forsteri) walking with chick, Adelie Land, Antarctica, January.

Frederique Olivier / Emperor penguins (Aptenodytes forsteri) walking in blizzard, Adelie Land, Antarctica, January.

Frederique Olivier / Emperor penguins (Aptenodytes forsteri) walking and tobogganing in blizzard, Adelie Land, Antarctica, January.

Frederique Olivier / Wide angle shot of Adelie penguins (Pygoscelis adeliae) walking on sea ice, Adelie Land, Antarctica, January.

Frederique Olivier / Adelie penguins (Pygoscelis adeliae) walking in front of a blue iceberg, Adelie Land, Antarctica, January.

Christophe Courteau / Ostriches (Struthio camelus) running in the distance in a mirage, Sossusvlei, Namib-Nauckluft National Park, Namib Desert, Namibia.

Peter Bassett / King penguins (Aptenodytes patagonicus) in a breeding colony, with mountains in the background, Salisbury Plain, South Georgia.

Peter Bassett / King penguins (Aptenodytes patagonicus) walking towards and entering the sea near their breeding colony, Salisbury Plain, South Georgia.

Frederique Olivier / Two King penguins (Aptenodytes patagonicus) walking along the shore, shot tilts up from feet to head, Macquarie Island, Sub-Antarctic Australia.

Tui De Roy / Snares Crested penguin (Eudyptes robustus) group walking up granite slope into Oleander forest, Station Point colony. Snares Island, New Zealand Sub-Antarctic Islands.

Steven Kazlowski / Polar bear (Ursus maritimus) mother with two juveniles walking along ice edge during autumn freeze up, Beaufort Sea, off Arctic coast, Alaska

Sue Daly / Close-up of a Seven rayed starfish (Luidia ciliaris) moving over the seabed, showing use of its tube feet to walk, Sark, British Channel Islands, UK, August.

Sue Daly / Seven rayed starfish (Luidia ciliaris) moving over the seabed, showing use of its tube feet to walk, Sark, British Channel Islands, UK, August.

Sue Daly / Long legged spider crab (Macropodia) walking across the seabed, Sark, British Channel Islands, UK, June.

Anup Shah / Bornean Orangutan (Pongo pygmaeus wurmbii) female 'Princess' walking along a trail carrying her daughter 'Putri' aged 2 years on her back. Camp Leakey, Tanjung Puting National Park, Central Kalimantan...

Ingo Arndt / Christmas Island Red Crabs (Gecarcoidea natalis) crossing closed road, during annual migration, Christmas Island, Indian Ocean, Australian Territory, November 2009.

Ingo Arndt / Christmas Island Red Crabs (Gecarcoidea natalis) crossing road in huge numbers during annual migration, Christmas Island, Indian Ocean, Australian Territory

Ingo Arndt / Gentoo penguins (Pygoscelis papua) walking to the beach, Stromness Bay, South Georgia Island, Southern Ocean, Antarctic Convergence. November

Ingo Arndt / Fishing spider {Ancylometes bogotensis} on water surface, French Guyana

Francois Savigny / Tiger male carrying Chital deer kill, Bandhavgarh NP, Madhya Pradesh, India

Rob Drummond/ BIA / Pied Oystercatcher (Haematopus longirostris), Victoria, Australia

Danny Green / Bison (Bison bison) herd walking in line in snow, Yellowstone National Park, Wyoming, USA, February

Nick Garbutt / North American bobcat (Lynx rufus) striding through deep snow. Madison River Valley, Yellowstone National Park, Wyoming, USA. January

Steven Kazlowski / Polar bear (Ursus maritimus) silhouetted against setting sun, Bernard Spit, off the 1002 Area, Arctic National Wildlife Refuge, North Slope, Alaska, USA, October. Vulnerable species.

Andy Rouse / African Leopard (Panthera pardus) walking. Masai Mara, Kenya. February.