5 of 20: This undated photo provided by the Buffalo Zoo shows Koga, the Zoo's silver back gorilla. The Buffalo Zoo says the 24-year-old male gorilla got out of his cage into an aisle where the keeper was working Monday morning, March 19, 2012 and bit her on the hand and calf. The keeper locked herself in with the zoo's other gorillas and called the animal escape team. Police locked down the zoo while Koga was confined to a lounge outside public areas and was tranquilized. (AP Photo/The Buffalo Zoo) (AP Photo/ Anonymous)

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