ELEVEN WEEKS 



TWELVE WEEKS 



Fig. 10. Condition of the molt of the primaries of the greater 

 prairie chicken one week to twelve weeks of age. Blackened bases 

 of the feathers indicate that the feather is growing; juvenal feath- 

 ers are stippled and first-winter feathers are cross-barred. Feather 

 number one is at the right in each series of ten primaries. 



[37] 



