Koga, a 400-pound adult male gorilla, is seen in this undated handout photo from the Buffalo Zoo released on March 19, 2012. Koga escaped his cage at the Buffalo Zoo on Monday, biting a female zookeeper before being tranquilized and captured in what a SWAT team leader called, "the scariest thing I've ever done." Zoo officials said Koga, a 24-year-old silverback gorilla, took advantage of an unlocked door in his living quarters around 11 a.m. and slipped into the space behind it, used by zoo personnel but closed to the public. REUTERS/The Buffalo Zoo/Handout

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400-pound gorilla escapes, bites zookeeper at Buffalo Zoo