Assertion: dolphin | /r/CapableOf | portray television's flipper
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text: As for their happy demeanor, activist and former dolphin trainer Ric O'Barry, who captured and trained at least one of the dolphins that portrayed television's Flipper, became so convinced that dolphins were stressed, unhappy and even depressed in captivity that he has spent the past 40 years advocating for the end of dolphin shows at theme parks and aquariums and for the release of all captive dolphins back into the wild [source: