First just one or two of my hens were going bald on their back right at the base of the tail, and on theback of thar wings,now all of them have missing feathers around the base of their tail.. I know part of it is from my rooster,and some of them are compleatly down to skin around tail. I know i have some pak rats living in the drowers in a desk i have out in the barn,i keep killing them but more keep showing up.and the drowers are full of chicken feathers... Is it possible that the rats are getting feathers from the hens while the hens are roosting????????? Its not like the barn is infested with rats,really there is only that one place for the rats to be.and i only see one or 2 at a time. This is the only place feathers are missing.so i dont think its mites..