I have to admit, I do not really know my squirrels very well. If he has a long bushy tail, he's a tree squirrel. If not, he's a ground squirrel and fair game for target practice. Grin
The tree squirrels in this timbered region were dark gray with a body maybe ten or twelve inches long from nose to base of tail.
In all honesty, I imagine you could get almost as much meat from a mourning dove.
My Uncles who immigrated from the Eastern hardwood forests as kids have told me about squirrel hunts in preparation for family reunions. They told of squirrels "big as house cats" and clothes lines loaded near to breaking with carcasses waiting for the skillet.
