So the story goes....I divided the run that my 1 yr old hens had been using and put the 13 wk old teenagers in the other side. (with their own coop). We had some pecking going on with the older hens previously and 2 of the girls have peepers on. I suppose the stress of having less space may have caused this problem. The hens almost all have larger areas on their back where the feathers have been pecked out - no blood on skin pecking just missing feathers. My conclusion is they got stressed and started pulling out their own feathers, or other hens were pecking them? Maybe??? I've spent a great deal of time observing and I don't see any bad behavior...so I'm stumped. We've had a rat problem and I wondered if they could be doing that to the girls - but we got rid of the rats (mostly) and the feather loss continues. To add to all this craziness, yesterday we tore down the older hens coop and expanded the teenagers coop for them to have one nice big coop all together. I've been letting them free range a bit more lately to help with the stress of all this. The older hens of course are putting the teenagers in their place and I'm thinking about putting peepers on all the older hens for a few weeks, just to make sure the teenagers don't get pecked...would this be good or bad? Anyone have ideas of what to do next for the feather plucking??? They also seem to be getting a bit sunburned so I thought I would put pick-no-more on them today....argh help Please! 5 out of 9 of the older hens (one year olds) are back pecked...no signs of a molt...all are laying and there are NOT a ton of feathers everywhere. The breeds that are pecked are below Flo the blue wyandotte Mildred the wheaton EE Beatrice the GLW Gracie another EE Wilma the Welsummer The other 4 hens in this age group are not showing any signs of this back pecking. They are a buff orp, cuckoo maran, blue laced red wyandotte, & a RIR. Do you think their different temperaments that may make them less susceptible to stressful situations.