A population of thirteen-lined ground squirrels in Madison, Wisconsin, was studied during the spring and summer of 1961 and 1962. Conception dates varied within and between years. Males moved greater distances than females. Spring seemed to be the period when longest movements took place. Adults had a 29% annual survival rate, juveniles, only 16%. Females had a higher survival rate than males. High mortality among juveniles mainly occurred prior to hibernation. Three distinct types of burrows were noted.
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Orrin J. Rongstad (1965) studied this question.
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