In the spring of 2010, wildlife biologist Tony Fischbach visited the Chukchi Sea off the northwest coast of Alaska. He was there to study walruses in their remote Arctic habitat, but it wasn't an easy task. The Arctic is one of the coldest places on Earth, and Tony--unlike a walrus--wasn't naturally adapted for life in the extreme cold. Eventually, Tony was able to attach a radio transmitter to several walruses so he could track where they would travel...