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Park staff believe Klondike died in his sleep Thursday night.
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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.
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.