

1940 I94I 1942 1943 1944 1945 
Ae _ 
Sav Ee 350¢ 393 
10 
N.E. (LL 
LINOIS 630 
352 
101 canapa —~844 (778) 
oLYUVENILE RECOVERY RATES %e = 
"40 "4l '42 43 ‘44 45 
Figure 13 .—-Some First-season Recovery Rates for Mallards 
Unaged at the Time of Banding. The western 
Illinois data include Bellrose and Chase's 
(1950) adjustment to correct for the fact 
that the birds were banded during the hunting 
season. 
Figure 1). Mallard First-season Recovery Rates by Broad 
Age Classes. Numbers on each curve indicate 
the number of birds actually banded. 
129 
