I have 8 pullets, 2 GLWs, 2 RIRs, 2 BOs and 2 BAs. They have been laying eggs for the last 2 months. Last week they started picking and eating each others feathers. No mites or lice. I added black sunflower seeds to their diets which cleared up some feather picking they did previously (at 10 weeks old). This week three have their bottoms plucked bare and two others have the beginnings of bare bums. I ordered some no-pick formula from online and am waiting for it to show. I've caught one of the RIRs picking feathers, and pecking at the other RIRs' vent. The culprit RIR only has very small patches of missing feathers. My GLWs both have all their feathers, so either they are the peckers or just good at not getting picked on. They have four square feet of coop floor each and they have ten square feet of pen each. I feed them organic layer pellets (switched from crumbles two bags ago) and also throw them our food waste and my garden waste. Anyway, what else to do? I'm going to give them some yogurt too... I have read people recommend cat food too, and other sources say never give cat food. Sigh. At this point, are they just going to pick each other to death?