Roy Mangersnes / Juvenile female Polar bear (Ursus maritimus) hunting for seals at breathing holes in the ice, Svalbard, Norway, March.
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Norbert Wu / Scuba diver exploring ice caves below Weddell Seal (Leptonychotes weddellii) breathing holes, life below feeds on seal feces, Antarctica
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Olga Kamenskaya / Hole in ice used by Baikal seals (Pusa sibirica) for breathing. Lake Baikal, Russia, April.
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Olga Kamenskaya / People looking at hole in ice used by Baikal seals (Pusa sibirica) for breathing. Lake Baikal, Russia, April 2009.
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Olga Kamenskaya / Hole in ice used by Baikal seals (Pusa sibirica) for breathing. Lake Baikal, Russia, April.
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Franco Banfi / Plumose sea anemones (Metridium senile) under ice with cut breathing holes visible above, Arctic circle Dive Center, White Sea, Karelia, northern Russia
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Bryan and Cherry Alexander / Inuit hunter checking seal net, Bushnan Island, Savissivik, Northwest Greenland, 1998.
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Bryan and Cherry Alexander / Inuit hunter hauling dead seal from breathing hole near Cape York, Northwest Greenland.
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Bryan and Cherry Alexander / Inuit hunters hauling Bearded seal (Erignathus barbatus) caught at breathing hole. Northwest Greenland, 1980.
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Bryan and Cherry Alexander / Fur clad Inuk waiting to harpoon seal at breathing hole. Northwest Greenland, 1980.
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Bryan and Cherry Alexander / Breathing hole in sea ice. Arctic seals have a network of these to avoid predators. Northwest Greenland, 1980.
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Norbert Wu / Weddell Seal (Leptonychotes weddellii) mother and pup float in shallow water under sea ice crack, their breathing holes visible in background, Antarctica
