Fig. 60. Blue Jays 

 at their nest, amid 

 foliage. [See p. 110, 

 Chap. XIX.] 



Fig. (ll. Chickadee at 

 nest hole. Light-aud- 

 shadow-picturing general- 

 ized obliterative pattern, 

 most potent in snowy win- 

 ter. Notice how the black 

 head - markings 'merge* 

 with the dark hole beyond. 



Photojjraphetl from life by 

 Finley and Bohlman. Courtesy 

 also of "The Condor." 



