4 of 20: In a photo provided by the Detroit Zoo, one of three new North American river otters dives in the pool on Thursday, June 7, 2012 at the Detroit Zoo in Royal Oak, Mich. The pups were born March 20 to 9-year-old mother Whisker and 6-year-old father Lucius. The births of the two males and a female double the zoo's river otter population. (AP Photo/Detroit Zoo, Mark M. Gaskill) (AP Photo/ Mark M. Gaskill)

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