Great Basin Naturalist


We evaluated movement distance (an index of home range size) based on capture histories of 32 postbreeding Townsend ground squirrels (Spermophilus townsendii) on a 15 × 15 trap grid in southwestern Idaho. Capture frequencies and movement distances of adult males were significantly greater than those of other sex/age groups. Members of the same sex/age group were rarely captured at the same grid location, evidence of mutual avoidance within sex/age groups. These results are compared with those for other species of ground squirrels.