[Circadian and seasonal changes in the temperature-regulating behavior of the American ground squirrel Citellus parryi].

Under uninterrupted (during 10 days) temperature registration from 4 nest boxes ("thermogradient" plant) clear-cut changes were determined: in preferable temperature (PT, degrees C, in 24 hrs at an average)--21.0 +/- 0.5 (spring), 22.