Several of our 1 year old hens have what look like downy feathers at the base of their tails, with our smallest hen also showing some mild feather loss on her wings. They free range all day, so if it is hen pecking I don't think it's due to boredom. There are 4 nesting boxes for 7 hens and we have one rooster. what else could be the culprit? And what to do if it is hen pecking?