BAY-BREASTED WARBLER. 



660. Dendroica castanea. 5% inches. 



Male, with crown, throat and sides rich chestnut; 

 female, paler; young and adults in winter, greenish 

 above, streaked with black and with a trace of chest- 

 nut on the flanks. 



These Warblers are only locally abundant during mi- 

 grations, while in eastern New England they are rare. 

 They are active insect hunters, darting rapidly about 

 the tree tops or, less often, in brush; their habits most 

 nearly resemble those of the Chestnut-sided Warbler. 



Song. A low, liquid warble. 



Nest. At low elevations in trees in swampy woods; 

 compact, cup-shaped structures made of fine shreds of 

 bark, rootlets and grass ; eggs bluish white, finely 

 specked around the large end with reddish brown (.70 x 

 .50). 



Range. Eastern N. A., breeding from the northern 

 edge of the IL So northward; winters south of the U. S. 



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