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ONE of the most popular places for backcountry skiing in North America is Teton Pass in Wyoming, high above the adventure playground of Jackson Hole.

This winter, as skiers and snowboarders unload gear for a day of sweat and powder-skiing, the researcher Kimberly Heinemeyer has been moving among them with a clipboard. Dr. Heinemeyer, a senior scientist with the research group Round River Conservation Studies, explains that she’s studying the effect of recreation on wolverines. She asks skiers if they will wear a small orange GPS armband for the day that tracks their movement. Most people gladly agree.

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