How do Arctic wolves survive in the freezing polar temperatures of the northernmost regions of the world? In March 2009, biologist David Mech traveled to Ellesmere Island, Canada--just 500 miles south of the North Pole--to find out. At the time, no one knew how these wolves survived the Arctic's harsh winter conditions, in which temperatures can dip as low as -70 F (-57 C) and food is scarce. But with the help of a special tracking collar and a wolf...