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Tilikum the Killer Whale: Murderous Beast or Playful Dummy?
Scientific American doesn't have any more insight than I do, but they did interview Brad Hanson, a wildlife biologist at the National Oceanic and Atmospheric Administration's Northwest Fisheries Science Center, who offers some insight on the behavior of Killer Whales in general.
Whether or not Tilikum was being aggressive or playful at the time of Brancheau's death is impossible to know, but I suppose the lesson here is it doesn't really matter.
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