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A polar bear and its cub in Arctic National Wildlife Refuge, Alaska.
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Polar Bear Mother and Cub

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A mother and calf humpback whale swim side-by-side.
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Mother and Calf

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A beluga whale
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Baby Beluga

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A gray seal on the shores of Surtsey, Iceland.
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A Unique World Heritage Site: Surtsey, Iceland

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A harp seal in icy water
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Seals, Sea Lions, and Walruses

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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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Ice-Loving Seals and the Loss of Sea Ice

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Ari Friedlaender, a research scientist at the Duke University Marine Lab, tags a blue whale.
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Acrobatic Blue Whales Do the Twist While Feeding

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Phoenix swimming with her calf.
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Scientists Use Bioacoustics to Protect Marine Mammals

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A Bryde's whale catches a meal
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The Case of the Mystery Whale

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An adult giant squid battles its only known predator - a sperm whale.
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Battle with a Sperm Whale

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A screenshot from video showing three orcas swimming.
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Killer Whale: Orca

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

Walrus: An Arctic Mammal in Peril?

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