Danny Green / Polar bear (Ursus maritimus) female resting with cubs on glacier. Svalbard, Norway, July.

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

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

Danny Green / RF - Arctic fox (Alopex lagopus) in winter pelage, camouflaged in snow. Svalbard, Norway, April (This image may be licensed either as rights managed or royalty free.)

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 / Reindeer (Rangifer tarandus) hunkering down in snow during blizzard. Svalbard, Norway, April.

Danny Green / Polar bear (Ursus maritimus) sleeping in snow. Churchill, Manitoba, Canada, November.

Nick Garbutt / American bison (Bison bison) female covered in hoar frost near hot spring, portrait. Midway Geyser Basin, Yellowstone National Park, USA. February.

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.)

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.

Lucas Bustamante / Marine Iguanas (Amblyrhynchus cristatus) basking. Fernandina Island, Galapagos Islands.

Jack Dykinga / Inspiration point covered in snow, Bryce Canyon National Park, USA, January.

Jack Dykinga / Landscape of hoodoos in snow at sunrise, Bryce Canyon National Park, Utah, USA, January.

Jack Dykinga / Winter snow storms cause wind-blown drifting along the canyon rim, Bryce Canyon National Park, Utah, USA, January.

Jack Dykinga / Conifer tree branch covered in snow and frost from winter snow storm. Bryce Canyon National Park, Utah, USA, January.

Jack Dykinga / Bryce Canyon National Park, Utah. Bristlecone pine clinging to the canyon rim at dawn, Bryce Canyon National Park, Utah, USA, January.

Espen Bergersen / Killer whales / orcas (Orcinus orca) feeding on a bait ball of Herring. Extremely cold conditions (- 15 C) with backlit ice fog. Kvanangen, Troms, Norway. January

Tui De Roy / Marine iguana (Amblyrhynchus cristatus) group on rocks, Cape Douglas, Fernandina Island, Galapagos

Nick Hawkins / Atlantic salmon (Salmon salar) under river ice. Quebec, Canada. October.

Yashpal Rathore / Bengal tiger (Panthera tigris tigris) dominant male (T29) cooling off in a waterhole Kanha National Park, Central India. Camera trap image.

SCOTLAND: The Big Picture / Mountain hare, (Lepus timidus), four animals on snowy hillside in winter, Scotland, UK, February.

SCOTLAND: The Big Picture / Mountain hare footprints in snow on mountain top in Glen Coe, Lochaber, Scotland, UK.February

SCOTLAND: The Big Picture / Buacaille Etive Mor and River Etive in winter, Rannoch Moor, Glencoe, Scotland, UK.December

Oscar Dewhurst / Red fox (Vulpes vulpes) sitting on a frozen lake at the edge of the reeds. London, UK. December.

Oscar Dewhurst / Red Fox (Vulpes vulpes) running through deep snow. London, UK. January

Terry Whittaker / Arctic fox (Vulpes lagopus). Blue colour morph. Hornstrandir Nature Reserve, Iceland. March

Marie Read / Snowy Owl (Nyctea scandiaca) female perched, Amherst Island, Ontario, Canada, January.

David Pattyn / Red fox (Vulpes vulpes) in deep snow emerging from den, Valsavarenche valley, Gran Paradiso national Park, Aosta Valley, Alps, Italy, December

Robert Valentic / Red-bellied Blacksnake (Pseudechis porphyriacus) basking on rock, Lerderderg Gorge, Victoria, Australia, February.

Stefan Christmann / Drifts of snow around glacier, Atka Bay, Queen Maud Land, Antarctica. October 2017.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) colony with with creche of huddling chicks, Atka Bay, Queen Maud Land, Antarctica. October.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) chicks lying down in the cold, Atka Bay, Queen Maud Land, Antarctica. October.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) males in breeding colony huddling during winter storm. Atka Bay, Antarctica. July.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) chick aged six to eight weeks sheltering on parent's feet, portrait. Atka Bay, Antarctica. September.

Nick Hawkins / Marine iguana (Amblyrhynchus cristatus) basking on volcanic rock at coast. Isabela Island, Galapagos.

Erlend Haarberg / Sunset in snow-covered mountain landscape. Okstindan, Fjell, Norway, February 2018.

Tui De Roy / Marine iguana (Amblyrhynchus cristatus) group on rock in the waves, Cape Hammond, Fernandina Island, Galapagos

Nick Garbutt / Pack of wolves (Canis lupus). Yellowstone National Park, Wyoming, USA. January.

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

David Tipling / Fieldfare (Turdus pilaris) in garden in freezing weather with snow on the ground Norfolk, England, UK. february

Guy Edwardes / Snow covered tree, Northumberland, England. November 2010

Guy Edwardes / Ice on Diamond Beach, Jokulsarlon, Iceland, September 2017.

Guy Edwardes / Shore of Lago de Predil covered in snow, Italy, February 2018

Ashley Cooper / Needle ice on Holly leaves (Ilex europaeus) in a woodland in Ambleside Cumbria UK. December 2008

John Chan / Honey bees (Apis mellifera) swarming on an old gas tank and establishing a new nest site within, with some individuals beating their wings to create air circulation, Southern California, USA, February...

Jeff Foott / Yacare caiman (Caiman yacare) with butterfly on snout, Cuiaba River, Pantanal Matogrossense National Park, Pantanal, Brazil.

Guy Edwardes / The Old Man of Storr in winter, Trotternish Peninsula, Isle of Skye, Inner Hebride, Scotland, UK. January 2015.

Guy Edwardes / The Old Man of Storr in winter, Trotternish Peninsula, Isle of Skye, Inner Hebride, Scotland, UK. January 2015.

Bernard Castelein / Grasses covered in frost, Klein Schietveld, Brasschaat, Belgium, January 2009.

Bernard Castelein / Birch tree (Betula pendula) covered in hoar frost, Groot Schietveld, Wuustwezel, Belgium, December 2007.

Bernard Castelein / Row of three trees in snow, Groot Schietveld, Wuustwezel, Belgium, January 2010.

Gavin Hellier / Timelapse from day to night of people visiting the illuminated ice sculptures at the Harbin Ice and Snow Festival, Heilongjiang Province, China, February 2015. Hellier

Andy Rouse / Bengal tiger (Panthera tigris) female 'T19 Krishna' with juvenile in water, Ranthambhore, India

Andres M. Dominguez / Blue butterfly (Lycaenidae) frozen in ice, Cortes de la Frontera, Los Alcornocales Natural Park. Spain. Highly commended in the Other animals category of the GDT European Wildlife Photographer of th...

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

Markus Varesvuo / Pine Grosbeak male (Pinicola enucleator)and traffic light Oulu, Finland, December

Sergey Gorshkov / Moonrise at twilight, Putoransky State Nature Reserve, Putorana Plateau, Siberia, Russia

Sergey Gorshkov / Sunset over Putoransky State Nature Reserve, Putorana Plateau, Siberia, Russia, October.

Radomir Jakubowski / Red fox (Vulpes vulpes) face portrait in snow, Grand Teton National Park, Wyoming, USA, February.

Radomir Jakubowski / Red fox (Vulpes vulpes) in snowfall, Grand Teton National Park, Wyoming, USA, February.

Michel Roggo / Meltwater channel through icefield in the Temnik River, Baikal Nature Reserve, Buryatia, Siberia, Russia, May 2015.

Jussi Murtosaari / Blackcap (Sylvia atricapilla) female and two males huddling together for warmth while sleeping, Finland, May.

Tui De Roy / Marine iguana (Amblyrhynchus cristatus) two on beach, Santa Cruz Island, Galapagos.

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

Ingo Arndt / Svalbard reindeers (Rangifer tarandus platyrhynchus) running in snow, winter, Spitsbergen, Svalbard, Norway, April

John Waters / Timelapse of temperature inversion clouds at sunset, Swiss Alps, Switzerland. October 2013.

Frederique Olivier / Close-up of a Black browed albatross (Thalassarche melanophris) preening its chick, chick looks up panting, thermoregulating, West Point Island, Falkland Islands.

Peter Bassett / King penguin (Aptenodytes patagonicus) standing on its heels on a rock to keep its feet warm, Salisbury Plain, South Georgia.

SCOTLAND: The Big Picture / Mountain hare (Lepus timidus) resting in a snowhole, with windblown snow, Cairngorms National Park, Scotland, UK, January.

SCOTLAND: The Big Picture / Mountain hare (Lepus timidus) sheltering in blizzard conditions, Cairngorms National Park, Scotland, UK, January.

SCOTLAND: The Big Picture / Mountain hare (Lepus timidus) in a freshly dug snow hole, Cairngorms National Park, Scotland, UK, December.

John Cancalosi / Group of gravid female Timber rattlesnakes (Crotalus horridus) basking before giving birth, Pennsylvania, USA, July.

Sergey Gorshkov / Plume of volcanic ash lit by a basaltic lava flow from the Tolbachik volcano complex, Kamchatka, Far East Russia, eruption lasted from December 22nd 2012 through to January 2nd 2013

Dietmar Nill / European hornet (Vespa crabro) fanning nest with wings to regulate the temperature, Germany, September.

Ingo Arndt / Japanese macaque being groomed in hot thermal spring {Macaca fuscata} Joshin-etsu NP, Japan

Ingo Arndt / Japanese macaques with young in hot spring {Macaca fuscata} Joshin-etsu NP, Japan

Ingo Arndt / Japanese macaque warming in hot thermal spring {Macaca fuscata} Joshin-etsu NP, Japan

Ingo Arndt / Japanese macaque warming in hot thermal spring {Macaca fuscata} Joshin-etsu NP, Japan

Ingo Arndt / Japanese macaques warming in hot thermal spring {Macaca fuscata} Joshin-etsu NP, Japan

Ingo Arndt / Desert Chameleon {Chamaeleo namaquensis} walking on hot sand, Namibia.

Konrad Wothe / Chimpanzee (Pan troglodytes) sitting in the rain, Mahale Mountains National Park, Tanzania.

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

Ingo Arndt / Polar Bear (Ursus maritimus) on icefield with moon in late winter, Svalbard, Spitsbergen, Norway, April

Ingo Arndt / Polar Bear (Ursus maritimus) on icefield with moon in late winter, Svalbard, Spitsbergen, Norway, April

Doug Perrine / Hot lava from the 61G flow, emanating from Pu'u O'o on Kilauea Volcano, flows over sea cliffs into the ocean under the stars and moon, Kamokuna, Kalapana, Hawaii Volcanoes National Park, Puna, Hawaii...

David Pattyn / Chamois (Rupicapra rupicapra) in deep snow, Gran Paradiso National Park, Italy. November. Commended in the Asferico Photography Competition 2016.

Andy Rouse / Iceberg and mountain, Svalbard, Norway. Arctic. July.

Jussi Murtosaari / European Dipper (Cinclus cinclus) on ice next to stream, winter, Finland. February.

Enrique Lopez-Tapia / Travelers watching lava on Erta Ale volcano crater. Afar Region, Ethiopia, Africa. November 2014.

Christophe Courteau / Lava Lake at night in the crater of Nyiragongo Volcano, Virunga National Park, North Kivu Province, Democratic Republic of Congo. September 2015.

Christophe Courteau / Lava Lake at night in the crater of Nyiragongo Volcano, Virunga National Park, North Kivu Province, Democratic Republic of Congo. September 2015.

Roy Mangersnes / Marine iguana (Amblyrhynchus cristatus) resting on log in sunlight, Fernandina Island, Galapagos, April.

Roy Mangersnes / Marine iguanas (Amblyrhynchus cristatus) basking on rock next to skeleton of one which starved to death. Unusually warm El Nino waters have killed a lot of the algae which is the food for these iguana...

Roy Mangersnes / Coastal scene on Fernandina Island, with small group of Marine iguanas (Amblyrhynchus cristatus). Galapagos. April 2016. Normally there would be a much larger group but El Nino weather has killed off...

Andres M. Dominguez / Fly agaric mushrooms (Amanita muscaria) in snow, Los Alcornocales Natural Park, Cortes de la Frontera, southern Spain, January.

Jussi Murtosaari / Common magpies (Pica pica) perched on frost covered branches, Jvaskyla, Finland, January.