Alaskan huskies that participate in the grueling Iditarod Trail Sled Dog Race must run 1,100 miles while enduring heavy blizzards, temperatures as low as -40 degrees Fahrenheit and winds up to 60 miles per hour, all of which earn the hearty canines status as the world's premier ultra-endurance animal athletes.
How do they do it? New research suggests the canines are superior to most other mammals, including humans, in at least three key areas: They are unusually adept at adapting to exercise, they have superior aerobic capacity and are unusually efficient in using food as fuel.
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