Records are available of observations at 14 different places in the Park
and in 19 different years between 1930 and 1960. Approximately
two-thirds of the observations have been on Prater Grade or in upper
Prater Canyon or in upper Morfield Canyon. On the morning of August 24,
1956, Harold Shepherd and I heard the whistle of an animal that he was
certain was a marmot, 2 mi. NNW of Rock Springs at the west rim of
Wetherill Mesa. Mr. Shepherd has worked in areas occupied by marmots for
years in southwestern Colorado. Wetherill Mesa is the locality farthest
west in the Park where marmots are known to occur. They occur as far
south as Cliff Palace.