Whip, sometimes the guys around here call them cat squirrels because they are as big as a small house cat.
They come in all variety of colors: That one was the most striking I have ever seen- all black, except the socks, face mask, and tail tip were white.
They come with tan bodies, and the extremities black sometimes, and other times they are the color of a silverback grizzly with black tips, and I've even seen an all white one - not an albino, just a white one, with black feet, tail tip and face mask.
They are really something to watch..and they act much differently than regular gray squirrels.