加利福尼亞近海的海獺
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Sen Otters off the Coast of California
sea otters off the coast of Californiahave an unusual method of getting food．They dive to the floor of the sea to find the shell－fish they like．
When an otter brings a shellfish to the surface of the water，he floats on his back and puts the shellfish on his chest．Then the otter digs the meat out of the shell with his teeth．
Sea otters are especially fond of shellfish with a very hard shell．When the otter brings up one of these，he also brings a stone．He puts the stone on his chest，holding the shellfish in his front paws．He takes a wide swing and smashes the hard shell on the stone．Then he has no trouble getting at the meat in the shell．
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