Are Sled Dogs Our Most Superior Athletes?

A 10-year study at Oregon State University has revealed that Iditarod-competing Huskies are ridiculously well-oiled machines...A roughly 55-pound sled dog can burn up to 12,000 kilocalories per day - the equivalent of 24 Big Macs. Short of going back in time and studying beasts that did battle in the gladiatorial arena, I think we might have found nature's preeminent competitor here.