A polar bear swimming through the freezing waters of the Arctic Ocean, in the Beaufort Sea, Alaska. The season known locally as “freeze-up” starts the process of the sea ice forming, which means hunting season returns for these polar bears. Once the ice forms, they can venture out across the edges of it, hunting for their primary prey, seals. Polar bears are classified marine mammals, and spend much of their lives at sea. Polar bear, Ursus maritimus, Beaufort Sea, Arctic National Wildlife Refuge, Alaska.
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