In this December 22, 2016, file photo, Colo, the world's first gorilla born in a zoo, opens a present in her enclosure during her 60th birthday party at the Columbus Zoo and Aquarium in Columbus, Ohio. The Columbus Zoo and Aquarium said Tuesday, January 17, 2017, that Colo, the oldest known gorilla in the U.S., died in her sleep less than a month after her 60th birthday. (Photo by Ty Wright/AP Photo)
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