FILE - In this Dec. 22, 2015 file photo, Colo sits in her enclosure during her 59th birthday party at the Columbus Zoo and Aquarium in Powell, Ohio. The oldest known gorilla living in a zoo, a female named Colo, is slated to undergo a surgical biopsy sometime soon ahead of her 60th birthday on Dec. 22, 2016. The Columbus Zoo and Aquarium in Ohio says veterinarians have been monitoring a mass under Colo's arm that recently started causing her discomfort, so they want to take tissue samples to determine the cause and possible treatment. She'll also be getting a thorough medical check-up.(Tom Dodge/The Columbus Dispatch via AP)
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