Stock Photo - SPAWAR Navy Marine Mammal Programme, San Diego November 2006 California Sea lion, Nelson in training he wears a back pack at all times carrying a transponder which alows his handlers to locate him in the open ocean Sea lions are easier and faster to train than dolphins and have the advantage of being able to walk on land But of course lack the dolphin´s sonar capabilities they are especially good at working detecting swimmers in tight spaces around piers

Stock Photo: SPAWAR Navy Marine Mammal Programme, San Diego November 2006 California Sea lion, Nelson in training  he wears a back pack at all times carrying a transponder.

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