ADAPTATIONS TO DESERTS 



I6r 



29 31 33 35 37 



BODY TEMPERATURE °C. 



39 



Figure 6. Body temperatures of 12 Citellus tereticaudus measured periodi- 

 cally during the year. Individual measurements were grouped into 0.5 degree 

 intervals. The heights of the histogram represent the frequency at each interv^al. 

 The separation of June to October and November to May measurements were based 

 on the occurrence of spontaneous torpor at room temperature in the first category 

 and its absence in the second category. 



433 



