Percent 
80 
Q = seni 
May 20 July 19 Aug. 18 Sept. 17 
32 

(1.7 broods 
per sq. mile) 
(2.4 broods 
per sq. mile) 
(2.1 broods 
per sq. mile) 
(2.7 broods 
per sq. mile) 
Oct. 17 Nov. 16 
Figure 16.--MALLARD: FLIGHTLESS BROODS, EXPRESSED AS A PERCENTAGE 
OF ALL MALLARD BROODS PRODUCED, 1950-53 
[See text for explanation of these graphs] 
