'28 '30 '32 '34 ‘36 
-29 -31 -33 -35 -37 
MORTALITY 
RATE 
1004 
80r 
60 
40+ 
201 
NUMBER OF DAYS IN U.S. HUNTING SEASON 
MORTALITY RATE (PERCENT PER ANNUM) 

Figure 18.--Relation of Annual Mortality Rates (Adult Male Mallards 
Banded on the Pacific Coast) and Length of Hunting Season 
in the United States. 
Notice the lethal character of the staggered 30-day 
season in 193-35. Each year begins September 1. 
U4 5b, 
