Number of doves heard 
Number of doves heard 
Xe) 
30 
20 
10 
FIGURE ll. 
Summary of results of 5-crew counts. 
Plotted to show calling intensity in relatio to 
(June counts based on h-crews only). 
time. 

6) + 30 
Sunrise time in minutes 
Sunset time in minutes 

+6 

co ee ae a ee 
+90 

x 30 
