Killer Whale at San Diego SeaWorld Has Mysterious Wound

Debate brews about whether Nakai was injured during show or whale attack.
3:00 | 10/02/12

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Transcript for Killer Whale at San Diego SeaWorld Has Mysterious Wound
a movie. Now, to a disturbing story out of san diego seaworld, where a killer whale is recovering from a mysterious wound. The big question, did it come from an accident? Or from an attack from another whale? Abc's cecilia vega has the story. Reporter: This is what orcas do best at seaworld san diego, put on a killer show. But now, an 11-year-old killer whale at the park is injured, with a gaping whole so big, you can see his exposed jawbone. Seaworld says he was injured when he somehow came in contact with a portion of the pool. But animal rights activist says an anonymous whistleblower told them that he was attacked by other orcas. You can't keep three males together in a fish pond. They'll have nowhere to go unless they can swim through concrete when they feel Reporter: Peta has filed a complaint with the department of agriculture. It's hard to say if killer whales are playing rough or if these are just aggressive interactions between individuals. Reporter: Seaworld says veterinarians determined the injury is not an animal bite. And provided this video to abc news, showing him now on the mend. Trainers and veterinarians say they are closely monitoring his recovery and treating him with antibio antibiotics. He's doing very well, interacting with all of the whales at seaworld. Reporter: Experts say it's a reminder that these cute, capti captive creatures are wild and dangerous. For abc news, cecilia vega, abc news, los angeles.

This transcript has been automatically generated and may not be 100% accurate.

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