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Nature S29 Ep16: Bears of the Last Frontier: Arctic WanderersAs winter approaches, polar bears wait to hunt on sea ice in Kaktovik, Alaska; in late spring, grizzlies await caribou on the northern slope of Alaska's Brooks Range.

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Now PlayingNature S29 Ep16: Bears of the Last Frontier: Arctic WanderersAs winter approaches, polar bears wait to hunt on sea ice in Kaktovik, Alaska; in late spring, grizzlies await caribou on the northern slope of Alaska's Brooks Range.0Nature: The Good, the Bad, and the GrizzlyGrizzly bears cause social and environmental problems at Yellowstone National Park.