Polar bear mother and cubs, Ursus maritimus, in the frozen Hudson Bay, Canada

Polar bear mother and cubs, Ursus maritimus, in the frozen Hudson Bay, Canada

© Kike Calvo/Corbis

Polar bear mother and cubs, Ursus maritimus, in the frozen Hudson Bay, Canada

Polar bear mother and cubs, Ursus maritimus, in the frozen Hudson Bay, Canada

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