Hello All, My 1 year old Isa Brown (Parma) is sick. She hasn't been acting herself and is being picked on by the others. She has been keeping to the coop and when she comes out she is forced back in by the other chooks, who she normally gets on well with. She just sits in the corner with her eyes closed. I have isolated her and on closer inspection I have noticed she is missing feathers from around her neck and her tail feathers are somewhat colourless. Any idea?