We have been feeding our back yard squirrels for the fall and winter and we noticed that a few of them have missing fur. One has a patch missing down his back and under both arms. Also another has some missing on his whole chest. They are all eating and seem to have a good appetite. We feed them a variety of nuts ( walnuts, pecans, hazlenuts, pumpkin seeds and sunflower seeds). They also have fresh water daily. We do not feed them with feeders, we place the nuts in several places on the ground. They do not all congregate there, they each will grab a nut and go and eat it in a seperate area away from each other. My question is, is this mange or are they molting their fur early? I live in Chicago IL and it has been unseasonably warm here this winter. I have searched online and everything they say about mange is bad and that it is fatal. Can a squirrel overcome mange on it's own? And also with us feeding them, does this give them a good fighting chance?