BLACK-THROATED GREEN WARBLER. 
667. Dendroica virens. 5 inches. 
Throat black; two wing bars and outer tail feathers 
white; female with little black on the throat. 
A common bird in pine groyes in northern United 
States, or during migrations in birch woods. I have 
found them most abundant on side hills covered with 
low-growth pines. They seem to be very nervous and 
are greatly excited if you appear near their nests. They 
often have the habit of building several nests, whether 
with the deliberate intent to deceive or whether because 
the first was not satisfactory as to location is not known. 
Song.—Entirely different from that of any other bird; 
a rather harsh ‘‘zee’’ repeated six times, with the fourth 
and fifth syllables lower. 
Nest.—Of rootlets and fine grasses, lined with hair; 
placed high up in pine trees; eggs white with fine brown 
specks around the large end (.60 x .50). 
Range.—Eastern North America, breeding from 
southern New England and Illinois north to Nova Scotia 
and Hudson Bay; winters in Central America. 
