Martha Holmes / Edge of large piece of ice sheet drifting in sea. Antarctic Peninsula. February 2008.

Mark Carwardine / Three Gentoo Penguins (Pygoscelis papua) standing at the edge of sea ice. Antarctic Peninsula, January. Book plate from Mark Carwardine's Ultimate Wildlife Experiences.

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

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...

Kathryn Jeffs / Cliff at edge of tabular iceberg, Antarctica, February 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...

Eric Baccega / Polar Bear (Ursus maritimus) walking on icepack with arctic coast in the background. Floe edge, Arctic Bay, Baffin Island, Nunavut, Canada, April.

Eric Baccega / Black-legged Kittiwake (Rissa tridactyla) on ice. Floe edge, Arctic Bay, Nunavut, Canada, April.

Eric Baccega / Melting ice at Floe Edge, Arctic Bay, Baffin Island, Nunavut, Canada, April 2009.

Eric Baccega / Melting ice under expansive clouds. Floe Edge, Arctic Bay, Baffin Island, Nunavut, Canada, April 2009.

Orsolya Haarberg / Spotted redshank (Tringa erythropus) at shallow water in snow, Ovre-Pasvik National Park, Norway

Kevin Schafer / Edge of the Monaco Glacier, Leifdefjorden, Svalbard, Norway 2010

Oriol Alamany / Laguna Torre and Grande glacier below Cerro Torre (3102 m), Los Glaciares National Park, Andes, Patagonia, Argentina, January 2006

Guy Edwardes / Fjallsarlon glacial lake, edge of Vatnajokull glacier with reflections, Vatnajokull NP, Iceland, June 2009

Dietmar Nill / Grey heron (Ardea cinerea) with fish being attacked by Gull, Germany, winter

Wild Wonders of Europe / Jensen / Edge of iceberg with the moon in the sky, Greenland, August 2009

Wild Wonders of Europe / de la Lez / Expedition ship, Stockholm, moored at ice edge, with a person walking over ice, Svalbard, Norway, June 2008

Wild Wonders of Europe / Liodden / Coastal edge of the Smeerenburg glacier, Spitsbergen, Svalbard, Norway, June 2009

Michael Hutchinson / Edge of the Perito Moreno Glacier, Los Glaciares National Park, Argentina February 2009

Wild Wonders of Europe / Zacek / White throated dipper (Cinclus cinclus) walking along ice edge by unfrozen water, Kitkajoki River, Finland, February 2009

Andy Rouse / Polar Bear (Ursus maritimus) walking along ice edge, Svalbard, Norway

Jan Vermeer / Ice shelf, Antarctica

Suzi Eszterhas / Adelie Penguin (Pygoscelis adeliae) on edge of iceberg, Paulet Island, Antarctica

Mitsuaki Iwago / King Penguin (Aptenodytes patagonicus) at edge of ice shelf, Antarctica

Norbert Wu / Ice floes that have broken off sea ice edge in late summer, coast guard icebreaker in background, McMurdo Sound, Antarctica

Konrad Wothe / Emperor Penguin (Aptenodytes forsteri) trio on edge of ice, Antarctica

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

Tui De Roy / Polar Bear (Ursus maritimus) hunting on summer fjord ice, Spitsbergen, Svalbard, Norwegian Arctic

Norbert Wu / Coast guard icebreaker travels through ice floes which have broker off sea ice edge in late summer, McMurdo Sound, Antarctica

Flip Nicklin / Beluga (Delphinapterus leucas) whale, group swimming along ice edge, Lancaster Sound, Nunavut, Canada

Pete Oxford / Edge of fast ice with Adelie penguins, Australian Antarctic Territory, Antarctica

Juan Carlos Munoz / Melting ice on Jokulsarlon beach. Southern Iceland, Europe, November 2012.

Alex Hyde / Snow stained brown from tannin in frozen moorland pool. Derwent Edge, Peak District National Park, UK, January.

Staffan Widstrand / Polar Bear (Ursus maritimus) shaking off water at ice edge, Svalbard, Norway

Todd Mintz / Two Walrus (Odobenus rosmarus) hauled out on pack ice along the floe edge, Grise Fiord, Ellesmere Island, Nunavut, Canadian Arctic, June

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 whalers prepare to pull up a bowhead whale (Balaena mysticetus) catch along the edge of the open lead in the pack ice. Chukchi Sea, offshore from Barrow, Arctic coast of Alaska, Ap...

Steven Kazlowski / Inupiaq subsistence whalers break open a hole in the pack ice using a harpoon along the edge of an open lead, during spring whaling season, Chukchi Sea, offshore from Barrow, Arctic coast of Alaska

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 bring their umiak - bearded seal skin boat - back onto the edge of an open lead in the pack ice, during spring whaling season. Chukchi Sea, offshore from Barrow, Arctic coa...

Steven Kazlowski / Inupiaq subsistence whalers in their umiak - bearded seal skin boat - watch a polar bear (Ursus maritimus) sow and cub travel along the edge of the open lead in the pack ice, during spring whaling sea...

Steven Kazlowski / Inupiaq subsistence whaler at the front of an umiak - or bearded seal skin boat - spots a whale from the edge of an open lead in the pack ice during spring whaling season. Chukchi Sea, offshore from B...

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,...

Eric Baccega / Cone Island, seen from the floe edge off Ellesmere Island, Nunavut, Canada, June 2012.

Eric Baccega / Smith Island, seen from the floe edge off Ellesmere Island, Nunavut, Canada, June 2012.

Orsolya Haarberg / Edge of the Eyjafjallajokull ice cap, partly covered in volcanic ash after the subglacial eruption, Iceland, April 2010

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

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

Mark Hamblin / 2020VISION / Scot's pine tree (Pinus sylvestris) at sunrise in winter on the edge of Loch Garten, Abernethy Forest, Highland, Scotland, UK, February 2010

Mark Hamblin / 2020VISION / Snow covered tree on the edge of frozen and snow covered lake, Loch Morlich, Cairngorms National Park, Scotland, UK, January 2010. Did you know? The lowest temperatures ever recorded in the UK reached...

Ole Jorgen Liodden / Polar Bear (Ursus maritimus) on the edge of iceberg. Nordaustlandet, Svalbard, July.

Christophe Courteau / Leading edge of the Blomstrand Glacier as it enters King's Bay, Spitzbergen, Svalbard, Norway, July 2011.

Christophe Courteau / People in small boat in front of the leading edge of the Blomstrand Glacier as it enters King's Bay, Spitzbergen, Svalbard, Norway, July 2011.

Christophe Courteau / Leading edge of the Blomstrand Glacier as it enters King's Bay, Spitzbergen, Svalbard, Norway, July 2011.

Steven Kazlowski / Polar bear (Ursus maritimus) pair of curious spring cubs wade in shallow waters off newly formed pack ice, mother rests behind on ice, Bernard Spit, Alaska, USA, October

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, paws raised, and tries to balance itself, along Bernard Spit in autumn, 1002 area of the Arctic National Wildlife Refuge, Alaska, Oct...

Mike Potts / Trumpeter swans (Cygnus buccinator) and other waterfowl feeding at the ice edge on Marsh Lake, a resting and feeding area during their long flight north to the breeding grounds in Alaska, Marsh Lake,...

Mike Potts / Three Trumpeter swans (Cygnus buccinator) feeding at ice edge, two up-ending, resting during their long flight north to the breeding grounds of Alaska, Marsh Lake, Yukon, Canada, April

Frederique Olivier / Blizzard on the fast ice edge near Mawson Station, Antarctica, March 2011.

Bryan and Cherry Alexander / Inuit man dressed in Reindeer / Caribou skin clothing while hunting at the floe edge. Igloolik, Nunavut, Canada, 1990. 40 BELOW bookplate.

Bryan and Cherry Alexander / Inuit hunter dragging Seal at the floe edge. Igloolik, Nunavut, Canada, 1990. 40 BELOW bookplate.

Bryan and Cherry Alexander / Inuit hunters hauling boat out of the water after seal hunting at the floe edge in frost smoke. Igloolik, Nunavut, Canada, 1990. 40 BELOW bookplate.

Bryan and Cherry Alexander / Inuit hunter using kayak at ice edge in winter. Northwest Greenland, 1980. 40 BELOW bookplate.

Bryan and Cherry Alexander / Inuit man hauling his floe edge boat while seal hunting at the ice edge. Igloolik, Nunavut, Canada, 1990.

Bryan and Cherry Alexander / Inuit hunter paddling a floe edge boat through frost smoke while seal hunting at the ice edge near Igloolik, Nunavut, Canada, 1990.

Bryan and Cherry Alexander / Inuit hunter paddling a floe edge boat through frost smoke while seal hunting at the ice edge near Igloolik, Nunavut, Canada, 1990.

Bryan and Cherry Alexander / At -40 degrees Celsius frost smoke rising off the freezing sea at the floe edge near Igloolik, Nunavut, Canada, 1990.

Bryan and Cherry Alexander / Inuk standing in floe edge boat at the ice edge, aiming his rifle while hunting. Igloolik, Nunavut, Canada, 1990

Bryan and Cherry Alexander / Male Killer whale (Orcinus orca) hunting along the floe edge by Mount Erebus. Ross Sea, Antarctica.

Bryan and Cherry Alexander / Yupik Eskimo seal hunting at the floe edge in Tkachen Bay. Chukotskiy Peninsula, Chukotka, Siberia, Russia, 2010

Bryan and Cherry Alexander / Yupik Eskimo hunter using inflatable boat to retrieve Ringed seal (Phoca Hispida) shot at the floe edge in Tkachen Bay. Chukotskiy Peninsula, Chukotka, Siberia, Russia, 2010

Bryan and Cherry Alexander / Yupik Eskimo hunters travelling to the floe edge by snowmobile with an inflatable boat. Tkachen Bay, Chukotskiy Peninsula, Chukotka, Siberia, Russia, 2010

Bryan and Cherry Alexander / Yupik Eskimo hunter shooting seal from the floe edge in Tkachen Bay. Chukotskiy Peninsula, Chukotka, Siberia, Russia, 2010

Bryan and Cherry Alexander / Weddell seal (Leptonychotes weddellii) diving into water from iceberg, Antarctica.

Bryan and Cherry Alexander / Yupik Eskimo hunter seal hunting at the floe edge in Tkachen Bay. Chukotskiy Peninsula, Chukotka, Siberia, Russia, 2010

Bryan and Cherry Alexander / Yupik Eskimo hunter seal hunting with his dog (Canis familiaris) at the floe edge in Tkachen Bay. Chukotskiy Peninsula, Chukotka, Siberia, Russia, 2010

Bryan and Cherry Alexander / Yupik Eskimo seal hunting at the floe edge in Tkachen Bay. Chukotskiy Peninsula, Chukotka, Siberia, Russia, 2010

Bryan and Cherry Alexander / Weddell seal (Leptonychotes weddellii) preparing to dive into water from iceberg, Antarctica.

Bryan and Cherry Alexander / Adelie penguins (Pygoscelis adeliae) on the edge of the fast ice in Antarctic Sound, Southern Ocean, Antarctica, October.

Bryan and Cherry Alexander / Icicles hanging from the edge of an undercut iceberg by the shore of Snow Hill Island, Antarctica, October 2009.

Bryan and Cherry Alexander / Edge of sea ice showing the reflection of the ice above and also the blue of the submerged ice. Antarctica, October 2006.

Eric Baccega / Inuit hunter on icepack. Floe Edge, Arctic Bay, Baffin Island, Nunavut, Canada, June.

Eric Baccega / Polar Bear (Ursus maritimus) feeding on a Narwhal (Monodon monoceros) on icepack as gulls wait to scavenge the carcass. Floe edge, Arctic Bay, Baffin Island, Nunavut, Canada, June.

Eric Baccega / Polar Bear (Ursus maritimus) feeding on a Narwhal (Monodon monoceros) on icepack as gulls wait to scavenge the carcass. Floe edge, Arctic Bay, Baffin Island, Nunavut, Canada, June.

Eric Baccega / Polar Bear (Ursus maritimus) feeding on a Narwhal (Monodon monoceros) on icepack. Floe edge, Arctic Bay, Baffin Island, Nunavut, Canada, June.

Eric Baccega / Polar Bear (Ursus maritimus) feeding on a Narwhal (Monodon monoceros) on icepack. Floe edge, Arctic Bay, Baffin Island, Nunavut, Canada, June.

Eric Baccega / Polar Bear (Ursus maritimus) feeding on a Narwhal (Monodon monoceros) on icepack as a gull waits to scavenge the carcass. Floe edge, Arctic Bay, Baffin Island, Nunavut, Canada, June.

Eric Baccega / King Eider (Somateria spectabilis) flying low over water. Floe edge, Arctic Bay, Nunavut, Canada, June.

Eric Baccega / King Eider (Somateria spectabilis) flying low over water. Floe edge, Arctic Bay, Nunavut, Canada, June.

Eric Baccega / Polar Bear (Ursus maritimus) walking on the horizon of the icepack. Floe edge, Arctic Bay, Baffin Island, Nunavut, Canada, June.