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...

Mike Wilkes / Snipe (Gallinago gallinago) probing for worms, Warwickshire, UK, February

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 / 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 / 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 penguins (Aptenodytes patagonicus) walk along beach, 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 / 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,...

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...

Jenny E. Ross / Polar Bear (Ursus maritimus) sub-adult male on cliff searching for eggs in Brunnich's Guillemot nests, as gulls look on from above. This unusual behaviour happens when when lack of sea-ice prevents t...

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 / 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 / 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 / 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

Frederique Olivier / Killer whale (Orcinus orca) amongst thick pack ice, Antarctica. Taken on location for the BBC series, Frozen Planet.

Frederique Olivier / Weddell seal (Leptonychotes weddellii) pup on ice beside mother, Antarctica, Taken on location for the BBC series, Frozen Planet.

Jeff Wilson / Royal Navy ship, HMS Endurance, crashing through the waves in the south atlantic ocean, Antarctica, November 2009. Taken on location for the BBC series, Frozen Planet.

Jeff Wilson / Pyramid of sea ice catching the first rays of the returning sun in the high Arctic, Svalbard, Spitsbergen, Norway, February 2009. Taken on location for the BBC series, Frozen Planet.

Jeff Wilson / Silhouette of Arctic wolf (Canis lupus) on sea ice, Ellesmere Island, Nunavut, Canada, June 2008. Taken on location for BBC series, Frozen Planet, Summer

Jeff Wilson / Pyramid of sea ice catching the first rays of the returning sun in the high Arctic, Svalbard, Spitsbergen, Norway, February 2009. Taken on location for the BBC series, Frozen Planet.

Jeff Wilson / Frozen Planet team tent at Lake Hoare Camp, Dry Valleys, Antarctica, December 2009. Taken on location for the BBC series, Frozen Planet.

Jeff Wilson / Royal Navy helicopter from HMS Endurance flying over sea and antarctic landscape, November 2008, Taken on location for the BBC series, Frozen Planet.

Jeff Wilson / Pyramid of sea ice catching the first rays of the returning sun in the high Arctic, Svalbard, Spitsbergen, Norway, February 2009. Taken on location for the BBC series, Frozen Planet.

Jeff Wilson / View through the porthole of science teams and Frozen Planet film crew working on the sea ice in the Bering Sea, Alaska, USA, March 2008. The film crew were in search of Spectacled eider ducks, temper...

Jeff Wilson / Emperor penguin (Aptenodytes forsteri) adults and chicks in colony beside ice cliff, Cape Crozier, Antarctica, November 2009. Taken on location for BBC series, Frozen Planet, Spring.

Jeff Wilson / Crew member of the US coastguard ship 'Healy' standing on the sea ice in front of the ship's hull after the ship became stuck in the ice, Bering Sea, Alaska, USA, March 2008. Taken on location for the...

Jeff Wilson / Director, Chadden Hunter, standing on wind eroded rock talking on radio to base camp, Dry Valleys, Antarctica, December 2009. Taken on location for the BBC series, Frozen Planet.

Bryan and Cherry Alexander / Emperor penguin (Aptenodytes forsteri) chicks playing with a piece of ice as they wait for their next meal. Snow Hill Island, Antarctica, October.

Terry Whittaker / 2020VISION / Grey heron (Ardea cinerea) standing on ice feeding on fish bought by visitors from supermarket, Reddish Vale Country Park, Greater Manchester, UK. Photographer quote: "It's great to see herons in loca...

Juergen Freund / A massive workforce of more than 300 women debone Milkfish (Chanos chanos) and pack them on ice. 60% for export market, mainly the Filipino communities living in North America and 40% consumed locall...

Edwin Giesbers / Four Mallard (Anas platyrhynchos) dabbling for food in icy water. The Netherlands, January.

Bryan and Cherry Alexander / Dolgan reindeer / caribou herder carrying block of ice to be used for drinking water. Taymyr, Northern Siberia, Russia, 2004.

Bryan and Cherry Alexander / Chukchi hunter scanning sea ice for Polar bears from his vantage point on top of pressure ice. Chukotka, Siberia, Russia.

Jeff Wilson / Camera crew searching for crevasse to film in, Gorner glacier, near Zermatt in the Swiss Alps, Switzerland. For BBC Planet Earth series, Mountains episode, 2006

Jeff Wilson / Film crew lowering camera into crevasse in Gorner glacier, near Zermatt in the Swiss Alps, Switzerland, for BBC Planet Earth series, Mountains episode, 2006

Bryan and Cherry Alexander / Qaggiq (large communal igloo for feasts) built from ice near Igloolik. Nunavut, Canada, 1999.

Wild Wonders of Europe / Popp-Ha / Matterhorn (4,478m) with reflection in Lake Riffel at sunrise, Switzerland, September 2008. WWE BOOK. WWE OUTDOOR EXHIBITION. NOT TO BE USED FOR GREETING CARDS OR CALENDARS TILL 2013 PRESS IMAGE.

Steven Kazlowski / Polar bear (Ursus maritimus) sow jumping while hunting for seals on sea ice, off the coast of Svalbard, Norway

Wild Wonders of Europe / Liodden / Walrus (Odobenus rosmarus) on ice, Spitsbergen, Svalbard, Norway, June 2009. WWE INDOOR EXHIBITION. UNAVAILABLE FOR COMMERCIAL USE WITHOUT PRIOR CONSENT.

Steven Kazlowski / Young Inupiaq woman with Sheefish (Stenodus leucichthys nelma) caught through a hole in pack ice over the Chukchi Sea, for the village elders of Kotzebue, Alaska, March 2008

Steven Kazlowski / Rifles used by Inupiaq for hunting whales, seals and birds, hidden behind a snow blind on the pack ice, off the Arctic coastal village of Point Hope, Chukchi Sea, Alaska, May 2008

Steven Kazlowski / Inupiaq subsistence hunter looking for Ringed seals (Phoca hispida) on pack ice near Point Hope, Alaska, Chukchi Sea, March 2008

Mark Brownlow / Mark Brownlow, producer of Freshwater programme for BBC Planet Earth series, behind ice sheet, on location at Lake Baikal, world's deepest and oldest (and largest by volume) freshwater lake, Siberia,...

Mark Payne-Gill / Polar bear tranquillised for transportation to sea ice Churchill, Canada {Ursus maritimus}

Staffan Widstrand / Tourist wrapped up for Dogsledging in midwinter Lapland, Sweden, -40C.

Staffan Widstrand / Lake ice, 4metres deep. Ellesmere Island, Canada. NOT AVAILABLE FOR ADVERTISING

Yva Momatiuk & John Eastcott / Arctic Fox (Alopex lagopus) in spring, looking for carrion on sea ice, North Slope near Arctic Ocean, Alaska

Yva Momatiuk & John Eastcott / Arctic Fox (Alopex lagopus) in spring, looking for carrion on sea ice, North Slope near Arctic Ocean, Alaska

Norbert Wu / Bald Notothen (Pagothenia borchgrevinki) living in iceberg, notothenioid fish has glycoproteins for antifreeze in blood to keep from freezing, silvery color acts as camouflage, Antarctica

Norbert Wu / Emperor Penguin (Aptenodytes forsteri) group on ice edge, calls are used to recognize each other and form pairs for mating, Antarctica

Flip Nicklin / Polar Bear (Ursus maritimus) cub searching underwater for mother who is hunting, Baffin Island, Nunavut, Canada

Mark Jones / Adelie Penguin (Pygoscelis adeliae) group gathers for mass exodus for safety against Leopard Seals, Ross Sea, Antarctica

Flip Nicklin / Bearded Seal (Erignathus barbatus) male resting on ice floe with head dyed red from the high iron content of ocean mud in which he hunts for shrimp and clams, Svalbard, arctic Norway

Martha Holmes / Emperor penguin flying out of water {Aptenodytes forsteri} Cape Washington, Antarctica. NOT AVAILABLE FOR NORTH AMERICAN GREETINGS CARDS UNTIL 11/01/18

Doug Allan / Two-week-old Emperor penguin chick sits on parent's feet under brood pouch for warmth {Aptenodytes forsteri} Antarctica

Juergen Freund / Harp seal surfacing at breathing hole searching for pup {Phoca groenlandicus} Magdalen Is, Canada, Atlantic

David Tipling / Emperor penguin chicks {Aptenodytes forsteri} huddled together for warmth, Weddell Sea, Antarctica

Sue Flood / Cameraman Doug Allan films Beluga whales surfacing to breathe at ice hole {Delphinapterus leucas} Canadian arctic. On location for Blue Planet, 1999

Bryan and Cherry Alexander / A traditional Selkup shovel for removing pieces of ice from the water while checking fishing nets in a frozen river, Krasnoselkup, Yamal, Western Siberia, Russia 2012

Bryan and Cherry Alexander / At a Selkup hunter's winter camp in the forest, a Laika dog has an 'igloo' for shelter, Ratta, Krasnoselkup, Yamal, Western Siberia, Russia 2012

Martha Holmes / Red algae in ice on shore. Antarctic Peninsula. February 2008. Taken on location for BBC tv series 'Life'

Martha Holmes / Aerial view of coast of Antarctic Peninsula. February 2008. Taken on location for BBC tv series 'Life'

Martha Holmes / Interior of Royal Navy helicopter showing pilots. Antarctic Peninsula. February 2008. Taken on location for BBC tv series 'Life'

Steven Kazlowski / Silhouette of Inupiaq subsistence whalers at the edge of an open lead in the pack ice, looking for passing bowhead whales as the mid-day sun follows the horizon. Chukchi Sea, offshore from Barrow, Arc...

Steven Kazlowski / Silhouette of Inupiaq subsistence whalers at the edge of an open lead in the pack ice, looking for passing bowhead whales as the mid-day sun follows the horizon. Chukchi Sea, offshore from Barrow, Arc...

Steven Kazlowski / Inupiaq subsistence whaler stands on jumbled ice at the edge of an open lead in the pack ice to look for passing bowhead whales, during spring whaling season. Chukchi Sea, offshore from Barrow, Arctic...

Steven Kazlowski / Inupiaq subsistence whaler stands on jumbled ice at the edge of an open lead in the pack ice to look for passing bowhead whales, during spring whaling season. Chukchi Sea, offshore from Barrow, Arctic...

Steven Kazlowski / Inupiaq subsistence whalers paddle their umiak - or bearded seal skin boat - and break thin ice forming in the open lead, allowing for passing bowhead whales during spring whaling season. Chukchi Sea,...

Steven Kazlowski / Inupiaq subsistence whalers get into their umiak - or bearded seal skin boat - in order to break thin ice forming in the open lead, allowing for passing bowhead whales during spring whaling season. Ch...

Steven Kazlowski / Inupiaq subsistence whalers with an umiak - a bearded seal skin boat - wait at the edge of an open lead in the pack ice and look for whales. Chukchi Sea, offshore from Barrow, Arctic coast of Alaska,...

Kerstin Hinze / Aerial view of Emden Port in winter, new cars for shipping overseas, East Frisia, Lower Saxony, Germany, February 2012

Kerstin Hinze / Aerial view of Emden Port, with boat at harbour and new cars for shipping overseas, East Frisia, Lower Saxony, Germany February 2012

Bertie Gregory / Red fox (Vulpes vulpes) on frozen pond, licking the ice for water, UK, February 2012

Konstantin Mikhailov / Russian winter in Altai Mountains, gorge valley of the river Kucherla, famous for its milky blue-and-green waters with riparian dark forest of Siberian spruce (Picea obovata) Siberian fir (Abies sibir...

Konstantin Mikhailov / Russian winter in Altai Mountains, gorge valley of the river Kucherla, famous for its milky blue-and-green waters with riparian dark forest of Siberian spruce (Picea obovata) Siberian fir (Abies sibir...

Konrad Wothe / Grey heron (Ardea cinerea) hunting for fish in frozen river, Usedom, Germany, January

Chadden Hunter / Cameraman, Didier Noirot, filming the formation of 'brinicles' (brine icicles or ice stalactites) under the ice, Ross Sea, McMurdo Sound, Antarctica. Taken on location during the filming of 'Winter' f...

Nick Upton / Mallard (Anas platyrhynchos) drake standing on frozen lake with its feet wide apart for stability on the ice, Wiltshire, UK, February

Chadden Hunter / Stormy conditions at the entrance to ice caves of Mount Erebus, Antarctica. Taken on location for BBC Frozen Planet series, 2009

Chadden Hunter / Stormy conditions outside the entrance to ice caves of Mount Erebus, Antarctica. Taken on location for BBC Frozen Planet series, 2009

Chadden Hunter / Filming around the extremely delicate ice formations in volcanic ice cave, Mount Erebus, Antarctica. Taken on location for BBC Frozen Planet series, 2009