Bird Architecture 



turn, make the chips rly ! To chisel two or three 

 inches of sound or even partially decayed wood is a 

 full day's work; yet, if for any reason the pair of car- 

 penters become disgusted with the site, they do not hes- 



Photo(fraph from life hy Dugmo 



, Chickadee and young (nest opened) 



itate about beginning another tunnel, another and still 

 another, in different trees until they finally complete 

 a horizontal passage descending abruptly into a pear- 

 shaped chamber. Truly the workman is known by 

 his chips ; here the finer ones remain in the nest 



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