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The bowhead whale has a massive, bow-shaped skull.
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Bowhead Whales

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A vaquita pops its head out of the water.
Slideshow

Vaquitas in Peril

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Map showing vaquita range in the Gulf of California with inset showing the Western Hemisphere and equator.
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A Small Range

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A marine mammal scientist listens for bowhead whales using an underwater hydrophone.
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Listening for Bowhead Whales

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This photograph was snapped as Phoenix swam in the Gulf of Maine in July 2008.
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Phoenix near Maine

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Sea lions generate thrust, or forward propulsion, by bringing their fore-flippers together in big sweeping motions called “claps.”  When a sea lion “claps,” it stretches its flippers out to the sides and sweeps them down. Then it tucks its flippe
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Aquatic Locomotion of a Sea Lion

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Three distinct types of killer whale can be found in the Antarctic, each with a different habitat and diet preference.
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Orcas in the Antarctic

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Narwhals with their long unicorn-like tusks.
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Narwhals Breaching

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A humpback whale breaching in Antarctic waters.
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Humpback Whale in Antarctic Waters

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Polar bears are threatened by a lack of sea ice.
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Polar Bears on "Thin" Ice

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An illustration of a recently discovered species of Monodontid, Bohaskaia monodontoides, and its beluga and narwhale relatives
Article

Smithsonian Scientists Describe a 'New' Fossil Whale

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An adult and juvenile killer whale frolic in the water.
Article

Menopausal Moms: A Mammal Mystery

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