Andy Rouse / Polar Bear (Ursus maritimus) portrait in sea-ice landscape. Wide angle / fish-eye shot. Svalbard, Norway, September.

Juan Carlos Munoz / Detail in frozen waterfall. Selijalandfoss waterfall, Southern Iceland, Europe, March 2011.

Paul Hobson / Small garden bumble bee (Bombus hortorum) frozen on small twig, covered in ice crystals, Sheffield, UK February 2011

Floris van Breugel / Natural iridescent oil film from decaying leaves at the surface of a pool, with a cottonwood leaf floating. Escalante National Monument, Utah. November.

Steven Kazlowski / Polar bear (Ursus maritimus) sow and cub sliding on their backs over the pack ice, much like ice skating, 1002 coastal plain of the Arctic National Wildlife Refuge, Alaska, USA

Mark Taylor / Perito Moreno Glacier, panoramic view, Argentina, January 2010

Eric Baccega / Young Inuit boy jumping over a crack on ice floe, Ellesmere Island, Nanavut, Canada, June 2012. Model released.

Konrad Wothe / Close up of iceberg in Inside Passage, Southeast Alaska, USA, July 2006

Konrad Wothe / Iceberg in Endicott Arm, Inside Passage, Southeast Alaska, USA, July 2006

Bertie Gregory / 2020VISION / Moorhen (Gallinula chloropus) running on a frozen lagoon, Brownsea Island, Dorset, England, UK, December

Fergus Gill / 2020VISION / Tree Sparrow (Passer montanus) Perching on a snow covered branch. Perthshire, Scotland.

Bertie Gregory / 2020VISION / Young Red fox (Vulpes vulpes) walking over ice of frozen pond in garden, Bristol, UK, February

Andrew Parkinson / 2020VISION / Moorhen (Gallinula chloropus) adult walking on frozen lake at dusk, backlit, Derbyshire, UK, February

Juan Carlos Munoz / Ice on lake, Plitvice Lakes National Park, Lika, Croatia, Europe, January

Juan Carlos Munoz / Ice on water, Plitvice Lakes National Park, Lika, Croatia, Europe, January

Chadden Hunter / Brinicles (brine icicles or ice stalactites) forming under the ice, growing towards the sea floor, Ross Sea, McMurdo Sound, Antarctica. Taken on location for 'Winter' episode of the BBC Frozen Planet...

Nick Upton / Mallard (Anas platyrhynchos) drake sliding on fresh snow after landing on frozen lake surface, Wiltshire, UK, February

Orsolya Haarberg / Stones frozen in ice, Helgeland, Norway, January

Erlend Haarberg / Air bubbles frozen in ice, Helgeland, Nordland, Norway, November

Mark Hamblin / 2020VISION / Stac Pollaidh at dawn with Loch Lurgainn in foreground, Coigach, Wester Ross, Scotland, UK, December 2010

Mark Hamblin / 2020VISION / Stac Pollaidh at dawn, with frozen Loch Lurgainn in foreground, Coigach, Wester Ross, Scotland, UK, December 2010

Mark Hamblin / 2020VISION / European river otter (Lutra lutra) footprints crossing frozen Loch Lurgainn at dawn, with Sgorr Tuath and Sgorr Deas (Beinn an Eoin) behind, Coigach, Wester Ross, Scotland, UK, December 2010

Mark Hamblin / 2020VISION / European river otter (Lutra lutra) footprints crossing frozen Loch Lurgainn at dawn, with Sgorr Tuath & Sgorr Deas (Beinn an Eoin) behind, Coigach, Wester Ross, Scotland, UK, December 2010

Peter Cairns / 2020VISION / Ice on mudflats, Morecambe Bay, Silverdale, Cumbria, England, UK, February

Roy Mangersnes / Mist above Monaco Glacier, North west of Spitsbergen, Svalbard, Norway, August

Roy Mangersnes / Juvenile Black-legged kittiwake (Rissa tridactyla) flying over Raudfjorden, North-western tip of Spitsbergen, Svalbard, Norway, September

Laurie Campbell / Highland bull (Bos taurus) face close up in freezing fog, Berwickshire Scotland, December

Graham Eaton / View of frozen Llynnau Mymbyr, a mountain lake, with fog partly revealing a mountain ridge, Snowdonia NP, Gwynedd, Wales, UK, December

Graham Eaton / Underwater view of a mountain lake with frozen surface, Llyn Idwal, Snowdonia NP, Gwynedd, Wales, UK, December

Brent Stephenson / A large hole in an iceberg with icicles hanging. Yalour Islands, Antarctic Peninsula, Antarctica, December.

Mark Hamblin / 2020VISION / Two Blue tit (Parus caeruleus) adults in winter, perched on twig with frozen crab apples, Scotland, UK, December 2010

Mark Hamblin / 2020VISION / Adult Robin (Erithacus rubecula) in winter, perched on twig with frozen crab apples, Scotland, UK, December 2010. Did you know? The association of Robins with Christmas came from the postmen, known as...

Mark Hamblin / 2020VISION / Female Blackbird (Turdus merula) perched in crab apple tree in winter, Scotland, UK, December 2010

Mark Hamblin / 2020VISION / Adult Robin (Erithacus rubecula) and adult Blue tit (Parus caeruleus) in winter, perched on twig with frozen crab apples, Scotland, UK, December 2010

Mark Hamblin / 2020VISION / Partially frozen River Spey in winter, Cairngorms NP, Scotland, UK, December 2012

Mark Hamblin / 2020VISION / European river otter (Lutra lutra) footprints in snow on the edge of the frozen River Spey, at sunset, Cairngorms NP, Scotland, UK, December 2010

Mark Hamblin / 2020VISION / Partially frozen River Spey in winter, Cairngorms NP, Scotland, UK, December 2012

Chadden Hunter / Entering the ice caves of Mount Erebus, Antarctica. Taken on location for BBC Frozen Planet series, 2009

Chadden Hunter / Person standing infront of long icicles, outside volcanic ice cave, Mount Erebus, Antarctica. Taken on location for BBC Frozen Planet series, 2009

Chadden Hunter / Cameraman Jeff Turner and Producer Chadden Hunter exposed at -40 degrees in Arctic circle in Northern Canada while filming wolves and bison hunting sequence. Taken on location for BBC Frozen Planet se...

Chadden Hunter / Aerial view of Timber wolves (Canis lupus) attacking a Bison calf (Bison bison) on the Arctic circle in Northern Canada. Taken on location for BBC Frozen Planet series, 2009

Chadden Hunter / Husky dog (Canis familiaris) Northern Canada, taken on location for BBC Frozen Planet series, 2009

Chadden Hunter / Close up of Husky dog eyes (Canis familiaris), note the different eye colour, Northern Canada. Taken on location for BBC Frozen Planet series, 2009

Chadden Hunter / Aerial view of hunting pack of Timber wolves (Canis lupus) in Arctic circle in Northern Canada, Taken on location for BBC Frozen Planet series, 2009

Chadden Hunter / King penguin (Aptenodytes patagonicus) chick creche enduring harsh weather, South Georgia. Taken on location for BBC Frozen Planet series, 2008

Chadden Hunter / King penguins (Aptenodytes patagonicus) walk along beach, South Georgia. Taken on location for BBC Frozen Planet series, 2008

Chadden Hunter / King penguin (Aptenodytes patagonicus) chicks in mass breeding colony, St Andrews Bay, South Georgia. Taken on location for BBC Frozen Planet series, 2008

Chadden Hunter / King penguins (Aptenodytes patagonicus) on beach, South Georgia. Taken on location for BBC Frozen Planet series, 2008

Chadden Hunter / King penguins (Aptenodytes patagonicus) heading out to sea, crossing tidal surf to feed in the open seas, South Georgia. Taken on location for BBC Frozen Planet series, 2008

Chadden Hunter / Emperor penguins (Aptenodytes forsteri) explode out of the water, returning to breed at Cape Washington, Antarctica. Taken on location for BBC Frozen Planet series, 2009

Chadden Hunter / Frozen Planet team, training on snow mobiles, Svalbard. Taken on location for BBC Frozen Planet series, 2008

Chadden Hunter / Filming on the Antarctic sea-ice at the edge of a small hole. A cameraman gets a shock when a Killer whale (Orcinus orca) mother and calf explode out of the water in front of his face. Taken on locat...

Chadden Hunter / Snow goose with gosling (Chen caerulescens) at sunset. Taken on location for BBC Frozen Planet series, 2008

Chadden Hunter / Emperor penguins (Aptenodytes forsteri) males dive through openings in the sea ice to take their first swim in over 4 months as they have spent the bleak winter incubating their eggs. Cape Washington,...

Chadden Hunter / King penguins (Aptenodytes patagonicus) crossing water to reach breeding site, South Georgia. Taken on location for BBC Frozen Planet series, 2008

Chadden Hunter / King penguins (Aptenodytes patagonicus) crossing water to reach breeding site, South Georgia. Taken on location for BBC Frozen Planet series, 2008

Chadden Hunter / King penguins (Aptenodytes patagonicus) crossing water to reach breeding site, South Georgia. Taken on location for BBC Frozen Planet series, 2008

Chadden Hunter / Southern elephant seal (Mirounga leonina) close up of sleeping individual, South Georgia. Taken on location for BBC Frozen Planet series, 2008

Doug Allan / Killer Whales (Orcinus orca) spy-hopping to observe Weddell Seal (Leptonychotes weddellii) in preparation to knock it from the ice by creating a wave. Marguerite Bay, Antarctic Peninsula, summer. Free...

Oriol Alamany / Grey glacier over Grey lake, Torres del Paine National Park, Patagonia, Chile

Sven Zacek / Frozen bubbles captured in ice on the surface of lake. South Estonia, Europe, January 2008.

Peter Cairns / 2020VISION / Group of Mute swans (Cygnus olor) on a partially frozen loch, Loch Laggan, Creag Meagaidh NNR, Scotland, UK, December 2010

Andy Rouse / Polar Bear (Ursus maritimus) sleeping on pack ice. Wide angle / fish-eye shot. Svalbard, Norway, September.

Ole Jorgen Liodden / Glaucous Gull (Larus hyperboreus) on blue ice. Spitsbergen, Svalbard, July.

Ole Jorgen Liodden / Glacier and mountain peaks. Spitsbergen, Svalbard, September.

Kathryn Jeffs / Southern elephant seal pup (Mirounga leonina), Antarctica, February, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Rainbow off Antarctica, February 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Tracks in snow of Adelie penguins (Pygoscelis adeliae) walking from coast to colony, Fish Island, Antarctica, February 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Cliff at edge of tabular iceberg, Antarctica, February 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Camera lens view of the 'Golden Fleece' in the centre of a horseshoe shaped iceberg off the Antarctic Peninsula, Antarctica, February 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Iceberg off the Antarctic Peninsula, Antarctica, February 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Icebergs off the Antarctic Peninsula, Antarctica, February 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Floe ice off the Antarctic peninsula at dawn, Antarctica, January 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Sun low in the sky over floe ice near the Antarctic peninsula, Antactica, January 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / 'Golden Fleece' (base ship of the BBC film crew) as it passes through floe ice off the Antarctic Peninsula, Antarctica, January 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Coastal landscape off the Antarctic Peninsula, Antarctica, January 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / The 'Golden Fleece' (base ship for BBC film crew) passing up the coast of the Antarctic Peninsula, Antarctica, January 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / The 'Golden Fleece' (base ship for BBC film crew) passing up the coast of the Antarctic Peninsula, Antarctica, January 2009, Taken on location for BBC Frozen Planet series

Steven Kazlowski / Polar bear (Ursus maritimus) curious cub sits up on its hind legs and tries to balance itself, along Bernard Spit in autumn, 1002 area of the Arctic National Wildlife Refuge, Alaska, USA, October

Steven Kazlowski / Polar bear (Ursus maritimus) curious cub sits up on its hind legs, paw raised, and tries to balance itself, along Bernard Spit in autumn, 1002 area of the Arctic National Wildlife Refuge, Alaska, US...

Steven Kazlowski / Polar bear (Ursus maritimus) curious cub stands along Bernard Spit as its mother and other cub rest in the background, 1002 area of the Arctic National Wildlife Refuge, Alaska, USA, October

Andrew Parkinson / Yellowhammer (Emberiza citrinella) perched on frost covered branches, Dumfries and Galloway, Scotland, UK, December.

Andrew Parkinson / Mute swan (Cygnus olor) drinking from the surface of a frozen lake, Derbyshire, UK, March.

Nick Upton / 2020VISION / Juvenile Common / Eurasian cranes (Grus grus) released by the Great Crane Project onto the Somerset Levels and Moors, on frozen snow covered pastureland. Somerset, UK, December 2010.

Graham Eaton / Ice on lake surface seen from below. Llyn Idwal, Snowdonia, Wales, December 2010.

Graham Eaton / Under the ice scene of freshwater frozen lake. Llyn Dinas, Snowdonia, Wales, December 2010.

Kathryn Jeffs / Southern Type B Killer whales (Orcinus orca) hunting Weddell seal (Leptonychotes weddelli) spyhopping to assess where seal is on ice floe and to intimidate, Antarctica. Taken on location for BBC Froz...

Kathryn Jeffs / Southern Type B Killer whales (Orcinus orca) hunting Weddell seal (Leptonychotes weddelli) using coordinated wave washing technique, Antarctica. Taken on location for BBC Frozen Planet series, Januar...

Kathryn Jeffs / Southern Type B Killer whale (Orcinus orca) hunting Weddell seal (Leptonychotes weddelli) spyhopping to assess where seal is on ice, whilst Humpback whale (Megaptera novaeangliae) surfaces nearby, Ant...

Kathryn Jeffs / Dr Robert (Bob) Pitman and Dr John Durban, scientific advisors, watching for Killer whales (Orcinus orca) on board the 'Golden Fleece', off Antarctic Peninsula, Antarctica, January 2009, Taken on loca...

Kathryn Jeffs / Southern Type B Killer whale (Orcinus orca) hunting Weddell seal (Leptonychotes weddelli), Antarctica. Taken on location for BBC Frozen Planet series, January

Kathryn Jeffs / Southern Type B Killer whales (Orcinus orca) hunting Weddell seal (Leptonychotes weddelli) using coordinated wave washing technique, Antarctica. Taken on location for BBC Frozen Planet series, Januar...

Kathryn Jeffs / Southern Type B Killer whale (Orcinus orca) spyhops to see if Crabeater seals (Lobodon carcinophagus) are potential prey, Antarctica. Taken on location for BBC Frozen Planet series, January 2009

Kathryn Jeffs / Filming Southern Type B Killer whales (Orcinus orca) in Antarctica. Taken on location for BBC Frozen Planet series, January 2009

Kathryn Jeffs / Adelie penguins (Pygoscelis adeliae) on ice floe, Antarctica. Taken on location for BBC Frozen Planet series, January 2009

Kathryn Jeffs / Adelie penguins (Pygoscelis adeliae) on ice floe, Antarctica. Taken on location for BBC Frozen Planet series, January 2009