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Two skulls belonging to extinct marine mammal herbivores used in the new study, both from the Smithsonian’s collections.
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Marine Mammal Herbivore Skulls

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An adult and juvenile killer whale frolic in the water.
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Menopausal Moms: A Mammal Mystery

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A hippopotamus-like creature swims underwater
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Flippers or Feet? An Extinct Mammal May Have Been Replaced By Today's Sea Cows

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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: An Arctic Mammal in Peril?

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Two nurse sharks hover over a baited cage
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Tale of a Whale

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Two nurse sharks hover over a baited cage
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Build Your Own Ecosystem

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Two nurse sharks hover over a baited cage
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How Diverse is That?

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Blue whale skull being installed at National Museum of Natural History.
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When Did Today’s Whales Get So Big?

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a veterinarian listens to a dolphin's heartbeat
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The Musical Hearts of Dolphins

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The Smithsonian Marine Mammal team moves into action after a dead sperm whale is spotted floating off Cape Hatteras, N.C.
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Sperm Whale Post-Mortem

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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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