3 of 20: A pair of Sifaka lemurs perch in a display at the Cincinnati Zoo, Thursday, Dec. 1, 2011, in Cincinnati. The seven-year-old male came from the Los Angeles Zoo, and the five-year-old female came from the Duke Lemur Center in North Carolina. The pair that is recommended to breed and are the first Sifaka's to be displayed at the Cincinnati Zoo. (AP Photo/Al Behrman) (AP Photo/ Al Behrman)

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