From MLive.com in Michigan:

ISLE ROYALE, MI – Two years ago this winter, after an arctic blast had frozen the surface of Lake Superior between Isle Royale and the Canadian mainland, a 4-year-old female wolf walked to the edge of Michigan’s most remote island after sunset. She took a few steps onto the ice … and kept going. About 15 miles later, the 70-pound wolf who sported a distinctive black fur mantle across the back of her tan coat, stepped onto the Canadian mainland, her GPS tracking collar showed.

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