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. 



74-0. HUDSONIAN CHICKADEE. Penthestes 

 hudsonicus hudsonicus. 



Range. Western half of British America. 

 These brown capped Chickadees 

 m. are very abundant throughout the 



Jy \^V northwest and are even tamer than 



our United States varieties. They 

 usually make their nests at low ele- 

 vations in dead and decayed stumps 

 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 

 .60 x .45. 



White 



Hudsonian Chickadee 



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 columbianus. 



Range. Rocky Mountains from northern United States to Alaska. 

 Like nudsonicus 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. 



