Rangers at Yosemite National Park are in a constant battle to keep wild black bears — with their ultra-keen noses and powerful paws and jaws — far away from humans.
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For the last 16 years, park rangers have done their best to warn visitors about the perils of leaving food in their cars, which a bear can easily peel open for a quick treat. And now a bear management team has begun outfitting bears with sophisticated GPS tracking collars to better understand their movements.