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

Roy Mangersnes / Polar bear (Ursus maritimus) holding piece of ice after licking off freshwater, Spitsbergen, Svalbard, Norway, August

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.

Bryan and Cherry Alexander / Piece of ice the size of a house crashing into Rype Fiord from Eielson Glacier. Scoresbysund, East Greenland, 2005.

Steven Kazlowski / Polar bear {Ursus maritimus} playing with a piece of meat, Coastal plain of the Arctic National Wildlife Refuge, Alaska.

Steven Kazlowski / Polar bear (Ursus maritimus) pair of spring cubs play tug-o-war with a piece of whale remains during freeze up, 1002 area of the Arctic National Wildlife Refuge, North Slope, Alaska, USA

Steven Kazlowski / Polar bear (Ursus maritimus) cub plays with a piece of bowhead whale baleen (Balaena mysticetus)along the arctic coast at sunrise, 1002 area of the Arctic National Wildlife Refuge, North Slope, Alaska...

Sandra Bartocha / Piece of ice on washed up on shore of Baltic sea, Germany, February 2010

Brent Stephenson / Group of Crabeater Seals (Lobodon carcinophaga) hauled out on a small piece of ice. Lemaire Channel, Antarctic Peninsula, Antarctica, January.

Brent Stephenson / Leopard Seal (Hydrurga leptonyx) lying on a piece of sea ice. Penola Strait, Antarctic Peninsula, Antarctica, December.

Kathryn Jeffs / Adelie penguin (Pygoscelis adeliae) adult pecking off piece of ice, Antarctica, February, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Adelie penguin (Pygoscelis adeliae) adult pecking off piece of ice, Antarctica, February, Taken on location for BBC Frozen Planet series