KEY TO BIRDS' NESTS 



BB. Thick walled, usually on horizon- 

 tal branch of apple or similar 

 tree usually decorated with bits 



of paper 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 diam- 



eter Robin 



2. Over 4 inches inside diameter. 



Bronzed Crackle 

 BB. Containing dead leaves and usually 



moss Wood Thursh 



AA. Built on buildings, bridges or cliffs. 

 B. Outer layer of grasses, mud within. 



1. Under 4 inches diameter Robin 



2. Over 4 inches inside diameter. 



Bronzed Crackle 

 BB. Outer layer of mud, some grasses. 



1. Open at top, cup-shaped 



Barn Swallow 



2. Open at side, gourd-shaped. . . 



Cliff Swallow 



BBB. Outer layer of moss and mud. . .Phoebe 

 VIII. With an Outer Covering of Lichens, Saddled on 

 Branch. 



A. Very small, less than 1^ inches out- 

 side diameter 



Ruby-throated Hummingbird 



AA. Larger, over 1^ inches outside diameter. 



1. Very deep, over 1^ inches 



Blue-gray Gnatcatcher 



2. Shallow, under 1^ inches 



Wood Pewee 



IX. Mostly of Bark, Fibers, and Rootlets, With or 

 Without Horsehair Lining. 

 A. Small woodland nests, usually in ever- 

 greens, less than 2 inches in diameter 



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