FEB., 1912. MAMMALS OF ILLINOIS AND WISCONSIN CORY. 117 



The Northern Gray Squirrel inhabits the more heavily wooded 

 portions of northern Illinois and Wisconsin. Its true home is in groves 



Black phase. Normal phase. 



Northern Gray Squirrel (Sciurus carolinensis leucotis). 



of hard wood timber, where it makes its nest both in hollow trees and 

 outside among the branches. When the latter kind is constructed, 



