The Killer in the Pool

Last February, when a 12,000-pound orca named Tilikum dragged his SeaWorld trainer into the pool and drowned her, it was the third time the big killer whale had been involved in a death. Many observers wondered why the animal was still working. But some experts, knowing the psychological toll of a life spent in captivity, have posed a darker question: Was it human error, or can a killer whale choose to kill?
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Originally published in Outside, July 2010