RON SANFORD / SCIENCE PHOTO LIBRARY RON SANFORD / SCIENCE PHOTO LIBRARY
Bull Walrus (Odobenus rosmarus) venture into the Bering Sea in search of food near Round Island, Alaska. After a long dive in frigid water the skin become pale as the animal's blood concentrates deep within its body. The Walrus regains its colour after lying in the Arctic sun for awhile.
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