I couldn't find any pictures of the squirrels who live in my crabapple tree, but here's a cute one I found on the internet.
We have Eastern Grey Squirrels- Sciurus caroliniensis. It is the North Carolina state mammal! They also have a "black phaze" color mutation within the species, I think.

Here is an interesting one I found! I black Eastern Gray Squirrel with a red tail!