In this Nature video, we learn how the Inuits of the Arctic Circle rely on their dogs. Existing on a diet of snow and seal blubber (fat), these dogs pull the sleds of the Inuits and protect them from wild animals. Multiple dogs pull together to maintain the stability of the sled. Sled dogs sometimes run the equivalent of five marathons (5 x 26.2 miles = 131 miles) per day. They will be the first to fall through the ice if there is a crack, but they recover from the cold plunge quickly. The dogs have evolved to master the harsh environment.
Learn more about the Nature film "Dogs That Changed the World."