I have a southern flying squirrel who is about 7 months old now. He is on a diet of squirrel blocks, an assortment of fresh veggies, fresh fruit and yogurt (not too too much), and nuts, seeds, and mealworms (these only occasionally) as treats. He gets out of his cage at least a few hours a day, and the cage itself is absolutely enormous with lots of toys, things to chew, nests to hide in, etc. Overall he seems completely healthy, and I always make sure he's getting enough calcium and protein. Nothing has changed in his daily routine or in his behavior, but a few weeks ago he developed a bald spot on his head. It does not look irritated, red, or flaky, and it's only that one little spot on his head, so I assume it's barbering. He must only do it at night when I'm not around, because I've never actually caught him in the act. He doesn't pay any mind to it whenever I see him, and it doesn't seem to bother him at all. I'm just wondering what I might be able to do to prevent him from rubbing his fur off in that spot, or if there's something I'm doing wrong that's causing this? Thank you.