AIXEN] BIRDS' NESTS 49 



2. Smaller, no lining, flat herons 



3. Hollowed, lining of bark crow and owls 



4. Hollowed, lining of fresh leaves or evergreens 



HAWKS 



5. Spherical nests squirrels 



AA. Smaller nests, less than 1 5 inches outside 



B. Cuplike, in chimneys, hollow trees, or silos 



CHIMNEY SWIFT 



BB. Otherwise 



C. Platform, ver\' shallow 



1. No lining mourning dove 



2. A little lining cuckoos 



CC. Deeply hollowed, i to 3 inches deep 



D. In thickets or scrubby trees, under ^^4 inches 

 inside diameter 



1. Of leaves and rootlets catbird and 



BROWN thrasher 



2. Of bark and wool migrant shrike 



DD. In trees usually evergreen, over 3^ inches inside 



diameter blue jay 



VI. felted nests of cottony materials 



A. Nests wider than high, containing thistledown 



goldfinch 

 AA. Nests higher than wide, no thistledowTi 



B. Thick walled, usually in vertical fork of bush or tree . . 



yellow warbler 

 BB. Thick walled, usually on horizontal branch of apple 



or similar tree least flycatcher 



BBB. Thin walled, usually close to trunk of small sapling. . 



redstart 



VII. containing layer of mud 

 A. Built in trees 



B. Of grasses and mud, usually no moss, or dead leaves 



1 . Under 4 inches inside diameter robin 



2. Over 4 inches inside diameter 



bronzed crackle 

 BB. Containing dead leaves and usually moss, wood thrush 

 AA. Built on buildings, bridges, or cliffs 

 B. Outer layer of grasses, mud within 



