That looks an awful lot like the black rat snakes we have near our house (and we're from the same area). They are pretty harmless (I've never had one in my coop) and can be helpful. However, these snakes were found all through my house when we moved in and we had problems with them for years after that. I don't care if they're outside, but when their in my house, I go on the defense! We had to spray every nook and cranie with expanding foam and did the coop just to be sure. Ever since we did that, we've had no snakes at all! If your not afraid, like i said they can be helpful (eating other snakes and mice), but if your squeemish, the black rat snake can get pretty huge... Good Luck!