aS 
oO 
RECOVERY RATE 

MORTALITY RATE 
Ww) 
oO 
1925 1924 1925 1926 
~-24¢ -25 -26 -27 
Figure 19.-=9First-season Recovery Rate (Broken Line) for All Waterfowl 
Banded in North America Compared to Adult Mallard Mortality 
Rates (Per Cent Per Annum) for Birds Banded in Illinois 
and Missouri (Solid Line). 
Sach year starts September 1. 
148 
