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The boom-or-bust life of an Arctic polar bear

Cameras mounted on polar bears have captured the fine line between feast and famine that characterizes bear life. In a study published Thursday in the journal Science, researchers found that polar bears burn more calories while hunting than previously believed.

Why it matters: Some populations of bears — including these bears on the Beaufort Sea — are in decline. As the Arctic warms and sea ice melts, bears will have to travel farther each hunting season. This study provides a baseline that will help researchers understand the impacts of climate change on polar bears in the future.