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Veterinarians at SeaWorld Orlando are waiting for test results to find out what caused the death of an 18-year-old polar bear.
Park staff believe Klondike died in his sleep Thursday night.
He had been at SeaWorld since 1995, when he was moved there with his sister, Snow, from the Denver Zoo.
A polar bear conservation group says the animals live an average of 15 to 18 years in the wild.
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