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BetterLivingThru t1_j1r6a8e wrote

Mostly they're starving to death, you see alot of photos of them emaciated up around Churchill. There are usually already bear populations present in the regions that can still better support polar bears, the bears hang around in their regions during the summer and wait for the sea ice where they can hunt seals, and burn their fat reserves in order to live. They don't naturally migrate giant distances like caribou, they keep still and try to conserve energy.

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