Columbus Zoo: oldest zoo gorilla doing well after biopsy before birthday

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POWELL, Ohio  — The oldest known gorilla living in a zoo is doing well after a surgical biopsy ahead of her 60th birthday on Dec. 22.

The Columbus Zoo and Aquarium said Saturday that veterinarians successfully removed a mass under the gorilla’s arm that recently started causing her discomfort.

The zoo also took tissue samples from the gorilla, a female named Colo, to determine the cause and possible treatment. She also got a thorough medical check-up.

Colo will remain off-exhibit while she is observed after the surgery.

Colo was the first gorilla born in a zoo. She has surpassed the usual life expectancy by two decades.

Colo is a mother of three, grandmother of 16, great-grandmother of 12 and great-great-grandmother of three.