Deer 255 is part of a herd that winters in the Red Desert of Wyoming. In the spring, some animals stay locally, some migrate up into the nearby foothills, and some, like 255, keep going on a serious long-distance migration. This incredible annual movement was only discovered a decade ago, and 255 now holds the record for the longest deer migration. She was first tagged by Anna and her helicopter cowboy colleagues six years ago, and has managed the 484-mile round-trip every year. She annually dodges wolves, crosses roads, and sneaks through oil fields in her search for greener pastures and a safe place to have her fawns.