KEY. TO BIRDS' NESTS 



BB. Over 2 inches inside diameter. 



1. With many or few hairs in lining. 



Song Sparrow 



3. No hairs, a few leaves 



Yellow-breasted Chat 

 XI. Spherical Nests of Grasses, Bark, or Fibers : 

 A. On the ground very thickly lined 



with soft grasses Meadow Mouse 



AA. In bushes or vines, usually on some 

 old bird's nest and lined with cot- 

 ton or wool Deer Mouse 



AAA. In trees or about buildings. 



1. Of bark and fibers, no lining, us- 



ually some leaves or sticks, 

 often on an old crow's nest. Squirrel 



2. Of grasses lined with feathers . . 



House Sparrow 



22 



