PRIMARY NO. 7 



PRIMARY NO. 8 



ALL MALES 



SELECTED MALES 



ALL FEMALES 



SELECTED FEMALES 



ADULTS 



YOUNG 







1 





I 

 I 









i 



90 



too 



■■ I — 



no 



120 



■' I ■ " 



130 



140 150 

 Millimeters 



160 



170 



180 



190 



Fig. 11. Variation in the length of primary feathers of the greater 

 prairie chicken by sex and age (cf. Table 2). The horizontal line 

 indicates the range, the vertical line indicates the mean, the open 

 rectangle indicates one standard deviation either side of the mean 

 and the blackened rectangle indicates two standard errors either 

 side of the mean. 



Weights of the Greater Prairie Chicken 

 IN Autumn 



Weights of 192 hunter-killed greater prairie chicken were ob- 

 tained on October 24, 1951, by the use of spring balances. The 

 balances were calibrated in 25 gram intervals. The weights were 

 analyzed and presented in the same fashion as were the data on 

 lengths of primaries. See table 3 and figure 12 on weight. 



[41] 



