Colo, World's Oldest Gorilla, Turns 60 (Photos)
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Colo enjoys her birthday cake on her 58th birthday.
Life-long resident
Colo has lived at the Columbus Zoo longer than any other animal in the zoo's collection.
Tasty treats
Colo celebrates her 59th birthday at the Columbus Zoo and Aquarium on Dec. 22, 2015, amid colorful decorations and various treats.
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