25]. 
15 
10 
FIGURE 1. Average number of CALLING DOVES per weekly 
trip (2) compared with average number of DOVES SEEN. 1951 
Calling 
Doves 
ia 
iN 
/ ae 
/ ~ 
/ 
/ 
/ 
/ 
/ 
/ 
_ / 
/ . \ / 
/ \ f 
/ ‘ ne 
/ Ne ji 
/ * ies 
/ Nae vt 
/ Doves ~~ sae ye 
j Seen. ~ ¢ ~~? 
~ ¢ 
™ Fa 
v7 La 
y 
=F. we 
= oe 
—= mes 
— 
— 
— 
= 
or \ 
6 33 \, \ 
By 
\ 
{ 1 
i 
peace _—oe ow 
