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How do walruses sleep in the water without drowning?

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  • "Odobenus rosmarus, Walrus." (Oct. 20, 2008)
  • Schliemann, Harald. "Grzimek's Encyclopedia of Mammals." Vol IV. McGraw-Hill. 1990.
  • "Walrus." SeaWorld/Busch Gardens Animals. Busch Entertainment Corporation. (Oct. 20, 2008).
  • "Walrus." Arctic Studies Center. Smithsonian National Museum of History. (Oct. 20, 2008)
  • "Walrus anatomy." Canadian Geographic. (Oct. 20, 2008)

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