1939 1946 1941 1942 1943 1944 |945 
40 -I4i -l42 -I43 _l44 _l45 —_la6 
loo 
50+ Ss. BANDED IN 
*<— ILLINOIS 
és \ 
1-200 . 
x \ 
O \ 
7 \ 
W100 oe 
Le. ‘ 
O \ 
5. t50 \ 
9 50 : 
is <— BANDED IN 
rey OKLAHOMA 
W 25 
a BANDED IN 
CANADA 
10 
Figure 16.--Mallard Mortality Curves Based on Hunters! Reports of 
Birds Shot 
Six of the eight mortality series in table 60 are shown 
here on semilogarithmic scales. Five of the curves show 
a marked increase in the number of deaths in the year 
194-45 over what normally would be expected. Each year 
begins September 1. 
