Percent 
(1.1 broods 
per sq. mile) 

80 
60 


(2.0 broods 
per sq. mile) 

enan gear eens es oo here caterasiitatanes teens geen Legh cee! Cree ege gee deat tatsr ang nctat atetatatacateew event sturucnse guage ee ogesectsratreagtatgt iste tga ceanr ds geiegencateuatat eter y anti aussie nt refer easete nd sri nrtenanregtny! cert iee! rletatedatetan tenet stot uaa 


(2.5 broods 
per sq. mile) 
(1.9 broods 
per sq. mile) 

Figure 17.--PINTAITL: FLIGHTLESS BROODS, EXPRESSED AS A PERCENTAGE. 
OF ALL PINTATL BROODS PRODUCED, 1950-53 
[See text for explanation of these graphs] 

O ae cores 
May 20 June 19 July 19 Aug. 18 Sept. 17 Oct. 17 #Nov. 16 
33 
