A colony of Columbian ground squirrels in the Idaho Primitive Area was observed from 1976 to 1978. Seven body measurements were recorded for juveniles obtained in 1978. There was a lack of sexual dimorphism among developing juveniles. The hind foot was the fastest developing feature. Juveniles obtain adult size their second year. Juvenile males exhibited the lowest interyear residency of either sex or age group examined.
Elliott, Charles L. and Flinders, Jerran T.
"Postemergence development and interyear residence of juvenile Columbian ground squirrels in the Idaho Primitive Area,"
Great Basin Naturalist: Vol. 40
, Article 7.
Available at: http://scholarsarchive.byu.edu/gbn/vol40/iss4/7