A colony of small mammals lives high above Crested Butte, just on the other side of West Maroon Pass from Aspen. And, for more than fifty years, the Rocky Mountain Biological Laboratory there has been watching the daily lives of these yellow-bellied marmots. It’s one of the longest running animal studies in the world. Our science reporter Ellis Robinson spent several days hanging out with the marmots and the “marmot-teers” who study them. In the first of two reports, Ellis explores what data the researchers are collecting.