THE BIRD BOOK 
739. Alaska Chickadee. 
ctus alascensis. 
Penthestes cin- 
Range. — Northern Alaska and eastern Si- 
beria. 
This bird, which is most like the Hudsonian 
Chickadee, nests in the usual manner and its 
eggs are like those of the common Chickadee 
of the east. 
740. Hudsonian Chickadee. Penthestes 
hudsonicus hudsonicus. 
Range. — Western half of British America. 
These brown capped Chickadees 
are very abundant throughout the 
northwest and are even tamer than 
our United States varieties. They 
usually make their nests at low ele- 
vations in dead and decayed stumps white 
and line the bottom of the cavity, 
which varies from three to eight inches in 
depth, with moss and fur. Their eggs, which 
they lay in May, June or July, are white, specked with reddish brown and 
cannot with any certainty be distinguished from those of the Black-capped 
Chickadees, the eggs of all the species showing considerable variations; size 
Hudsonian Chickadee 
.60 X .45. 
740a. Acadian Chickadee. Penthestes hudsonicus littoralis. 
Range.- — Kowak River, northwest Alaska. 
A larger and grayer form of the last species; nesting habits and eggs not 
differing. 
740b. Columbian CHICKADEE. Penthestes hudsonicus columhianus. 
Range. — Rocky Mountains from northern United States to Alaska. 
Like hudsonicus but with the crown slaty instead of brownish. No difference 
can be distinguished either in their habits or eggs. 
740c. Canadian Chickadee. Penthestes hudsonicus littoralis. 
Range. — Eastern half of Canada and northern New England and New York. 
These birds were formerly hudsonicus in company with the western ones, but 
they are now supposed to be a trifle smaller and with the crown duller; this 
division does not affect the similarity of their habits and eggs. 
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