Has overall gray or light brown fur with a white chest and belly and large, bushy gray tail with silver-tipped hairs. The "black squirrel"
is actually the black morph of the eastern gray squirrel: http://www.pbase.com/drjaysel/image/58441672

The eastern gray squirrel is smaller than the eastern fox squirrel, which has a rusty orange tail:
http://www.pbase.com/drjaysel/image/65036481
It is larger than the red squirrel, which is red.

The summertime leaf nest of the eastern gray squirrel is known as a drey. See the photo below. Their winter home is a hollow
tree or your attic!

http://www.unexco.com/drey.jpg