A little gray squirrel.
gray squirrel definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
any of several large, gray squirrels (genus Sciurus), native to the U.S.
gray squirrel definition by American Heritage Dictionary
A common squirrel (Sciurus carolinensis) of eastern North America, having grayish or blackish fur.