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Colo, the nation's oldest living gorilla, sits inside of her enclosure during her 60th birthday party at the Columbus Zoo and Aquarium, Thursday, December 22, 2016 in Columbus, Ohio. Colo was the first gorilla in the world born in a zoo and has surpassed the usual life expectancy of captive gorillas by two decades. Her longevity is putting a spotlight on the medical care, nutrition and up-to-date therapeutic techniques that are helping lengthen zoo animals' lives. (Photo by Ty Wright/AP Photo)
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