They usually nest in tree hollows-they love trees. I was squirrel hunting years ago and right at the top was a Momma with three babies climbing like monkeys. I thought it was a cougar at first-looked like one animal. I always thought fox squirrels lived just on ground but they love trees too. Years ago I was deer hunting and as it was starting to get light I kept hearing what sounded like monkeys in my tree. Then I could see these big shadows moving all over-it was 7 big mature fox squirrels. Freaked me out. Oh man I was hunting one day and this fox squirrel goes bouncing through tall grass in a pine stand. Well I see this head moving above the tall grass. It took a bit but then I realized it was a huge diamondback in hunt mode after the fox squirrel. I know it was over 6 ft and had at least a 3 in wide head-it was huge. Had head up like a cobra gliding and flicking that tongue. It looked like an anaconda. It would be groin high to me with its head up when I walked over to grass stand-one big mother. Never seen one larger.I had no idea they could climb.
When I bought my house a few circuits didnt work. The plan was to rewire anyhow, so no big deal. I found two wires in two different rooms that were completely chewed through. How a fire didnt start is beyond me.I bet mice, rats, and squirrels chew up some electrical lines -they sure chew everything else up. I bet they cause lots of fires.