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Undated file picture of Polar Bear 'Winner' at the Buenos Aires Zoo.... News PhotoAnimal,Argentina,Buenos Aires,Horizontal,Human Interest,Polar Bear,WinningPhotographer Collection: AFP 2012 AFPUndated file picture of Polar Bear 'Winner' at the Buenos Aires Zoo. Winner died of hyperthermia on December 25, 2012 due to the heat wave that affected the region earlier this week. Temperatures hit 45°C windchill factor. AFP PHOTO/NA-Zoo Bs. As. (Photo credit should read BUENOS AIRES ZOO/AFP/Getty Images)