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Tokyo — The slow demise of a stray whale that spent its last days circling Osaka Bay not only saddened TV viewers across Japan, it also alarmed cetacean experts who called the whale the latest casualty of a warming planet.

“Whales used to lose their way every three years or so,” Yasunobu Nabeshima, a visiting researcher at the Osaka Museum of Natural History, told CBS News. “Until now it was a rare phenomenon. But these incidents have increased.”

This month’s tragedy marked the second case in as many years.

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