High Quality Content by WIKIPEDIA articles! The eastern gray squirrel, or grey squirrel (depending on region), (Sciurus carolinensis), is a tree squirrel in the genus Sciurus native to the eastern and midwestern United States, and to the southerly portions of the eastern provinces of Canada. The native range of the eastern gray squirrel overlaps with that of the fox squirrel (Sciurus niger), with which it is sometimes confused, although the core of the fox squirrel`s range is slightly more to the west.