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5 Shocking Animal Attacks Caught on Tape

5 Shocking Animal Attacks Caught on Tape Captivity breeds aggression in many species, in water and on land. Trainers aren't the only victims. Zoos, associated with innocent family fun, have seen their share of ugly attacks -- many caused by humans going "off behavior." Watch the full story -- and see more amazing animal footage -- on "20/20: When Animals Strike Back" Friday at 10 p.m. ET


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