I have 4 GC's and 1 Arucauna that I've noticed are loosing feathers around the base of their tails. I also have 2 barred rock hens that don't seem to be having this problem. I've checked all of them for any signs of mites or other pests and don't see any. This appears as if "somehen" is pecking at them. We got rid of our Rooster about a month ago (which came in the same hatching batch as the other Barred Rocks) and I'm wondering if one of the Barred Rock hens is now taking the place of the Roo and pecking at the other hens. Any thoughts??