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.—Fastern United States, breeding from the 
Gulf to New Brunswick and Manitoba; winters chiefly 
in the southern parts of the United States. 7T66a. 
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. 
