intro: Zoos: They're supposed to be places of fun and learning, where curious animal admirers can observe an array of fascinating creatures at a safe distance under controlled conditions.
But sometimes, even at zoos, when humans get too close, tragedy can strike. Click through to read about five unbelievable animal attacks at zoos around the world.
Watch the full story -- and see more amazing animal footage -- on "20/20: When Animals Strike Back" NOW
title: Berlin Zoo, 2009,...Full Story