Help! Chicken picking on WHOLE flock. I have 6 pullets I raised this spring together. They are a mixed breed bunch. 2 ISA Browns, 2 Wyandots, 1 Brahama, and 1 Rhode Island Red. I noticed that all the chickens except for one had feathers plucked from her back. Some of them have feAthers pluked from their necks too. ONE of the Wyandotte's looks great and has NO feathers missing. I watched the flock closer and watched that one chicken peck ALL the other chickens at random times for no apparent reason. These chickens were raised together. They have been in their outside coup all summer. I don't know how long she has been doing this, but I noticed whole feathers in the coup a LOT. I thought it was odd because I had never had that with my other chickens. I have been raising chickens for four years now. I started fresh this year with all new pullets. So what should I do? What are my options? Should I slaughter her?