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Dawn Brancheau

'Blackfish' filmmaker 'never imagined' her documentary on SeaWorld would have such a major effect

'Blackfish' filmmaker 'never imagined' her documentary on SeaWorld would have such a major effect

It should have been fun — sitting in the Splash Zone at SeaWorld's Shamu stadium with her two sons, watching killer whales perform impressive tricks. Instead, Gabriela Cowperthwaite felt a pit in her stomach. Seeing whales up-close in captivity made her uneasy. So she began looking into the theme park, working on a documentary called "Blackfish" — a 2013 film that would ultimately shift the way the public viewed the multibillion-dollar corporation too.

Just three years after the release of "Blackfish," SeaWorld CEO Joel Manby...

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