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Sciurus carolinensis
Eastern Gray Squirrel: pale underparts, reddish flanks. Fox Squirrels have yellowish underparts and brownish flanks. Eastern Gray Squirrels largely outnumber the Fox Squirrels herein Georgia.
Nice photos!
There is no way this is a douglas squirrel. The douglas squirrel lives only in CA, OR and WA in the US, from the Sierra Nevadas/cascades west, and north into BC. Living in their range, I can also tell you they look nothing like this guy, who is most likely a Fox Squirrel