BLUEBIRD. 



766. Sialia sialis. 7 inches. 



These beautiful, gentle and well-known birds spend 

 the winter in the southern parts of the United States 

 and north to the snow line; some more hardy than the 

 rest are found throughout the winter in southern New 

 England. 



Call. A short sweet warble; song, a continued 

 warbling. 



Nest. In holes in trees, particularly in orchards, in 

 bird boxes or crannies about the buildings. The bot- 

 tom of the cavity is lined with grasses for the reception 

 of the four or five pale bluish eggs, which measure 

 .84 x .62. 



Range. Eastern United States, breeding from the 

 Gulf to New Brunswick and Manitoba ; winters chiefly 

 in the southern parts of the United States. 766a. 

 Azure Bluebird (azurea) is found in the mountains of 

 eastern Mexico and north casually to southern Arizona. 

 It is paler both above and below than our eastern bird. 



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