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. ETRead more http://feeds.abcnews.com/click.phdo?i=82540442e117dd08c4d63f34019195a8
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