Flight Activity of Bats 



81 



Period I 



Period II 



Period 



0.30 

 0.24 



Q 0.18 



h- 



c 



CD 

 0) 



^ 0.12 

 0.06 

 0.00 



10 15 20 



Interval Post-sunset 



25 



30 



0.30 



10 15 20 



Interval Post-sunset 



Fig. 1. Mean frequency of detection by 20-minute time intervals 

 (I IDF) post-sunset for P. t. virginiamis comparing sampling periods; males 

 (a): Period 1 = June. Period II = July, Period III = August 1990; 

 females (b): Period I = May, Period II = June, Period III = August 

 1991). Lee Countv, Kentucky. 



