My speckled sussex started losing feathers months ago. I separated her from the flock and treated her for possible mites/lice. After her feathers came back and upon integrating her back in with the flock my fears have been reassured. They have picked her clean again within three weeks. I don't want to keep putting her under the stress so for now I will separate her and when she goes back I will try Pine Tar to prevent the pecking and peepers if necessary.