I just got 30 chickens that were listed on craigslist as free. They are a mixture of different breeds. Some I am not even sure what they are. But about 8 of them have bald spots on thier backs and/or no tail feather area is bald. Would this be from an over populated coop? This guy had alot of chickens in his 4 coops. I ended up with 2 polish crested roos and the rest are hens. OH he also threw in a female turkey! She was in the coop with the chickens so I am guessing she will be ok with them now? Was not prepared for a turkey. Will have to get pics and see if you guys can tell me what she is.