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A narwhal breaches the surface, its tusk pointed to the sky
Article

Why a Tusk? The real-life unicorns of the sea and the tusks that make them famous

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A small Adélie penguin hops on a piece of ice.
Photo

Adélie Penguin Jumping Out of the Water

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The Antarctic minke whale is the only baleen whale found in the icy waters of the Antarctic.
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Antarctic Minke Whale

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An iceberg calves from Antarctica's Pine Island Glacier
Photo

Pine Island Glacier

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A team of scientists explore the Arctic ocean.
Photo

The Hidden Ocean

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Snow petrels hunt in Antarctic sea ice, feeding on krill and fish.
Photo

Snow Petrel

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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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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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A team of scientists explore the Arctic ocean.
Slideshow

Under Arctic Ice

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