Data were gathered concerning the seasonal activity pattern of a population of Columbian ground squirrels (Spermophilus columbianus) in the Idaho Primitive Area. Adult females were significantly more active in June of all years than were adult males. A relationship between ground squirrel activity and temperature is postulated in which the squirrels alter their activity so as to avoid high temperatures and possible heat stress.
Elliott, Charles L. and Flinders, Jerran T.
"Seasonal activity pattern of Columbian ground squirrels in the Idaho primitive area,"
Great Basin Naturalist: Vol. 40
, Article 15.
Available at: http://scholarsarchive.byu.edu/gbn/vol40/iss2/15