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A small Adélie penguin hops on a piece of ice.
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Adélie Penguin Jumping Out of the Water

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Emperor penguins are the largest of the penguin species and can grow to be 100 pounds.
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Emperor Penguins on the Ice

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Every year as the sun disappears for the winter, the surface waters around Antarctica freeze into a slab of ice 10-feet thick, which effectively doubles the size of the continent.
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Antarctic Pack Ice

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A marine biologist measures the temperature of an ice core.
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Measuring Ice Core Temperatures

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Walruses use sea ice as platforms on which to nurse their young and launch their dives.
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Walrus Rests on Ice

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On average, Arctic sea ice has decreased by four percent per decade since the late 1970s.
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Ice Melt in Iceland

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The Greenland glacier Jakobshavn Isbrae is massive, at around 40 miles long and more than a mile thick.
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Jakobshavn Glacier

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Weddell seals grind their teeth on holes in the ice to keep them open to their comings and goings between ocean and air.
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Weddell Seal in Antarctic Water

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Antarctica is almost entirely covered by ice sheets up to two miles (3 km) thick, which contain roughly 70% of the world’s freshwater.
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Ross Sea Ice Shelf

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A walrus sits on top of ice.
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The Cultural Icescapes of the Arctic

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A summertime channel carries melted ice to the sea. Antarctica and Greenland lose around 350 billion tons of ice each year from such melting.
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Ice Melt at the Poles

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In 2011, storms and lack of ice-cover due to a warmer winter climate resulted in hundreds of seal pups being washed up on the shore of Prince Edward Island. Like many, this young seal faced an uncertain future. See more Nature's Best Photos.
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Harp Seal, Prince Edward Island National Park, Canada

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