i have 18 RIR hens. all but one has back feathers picked down to skin . one has a open wound now . could the one be a roo , looks like hen short tail feathers . any advice on what i should do , dont want them eating each other . there coop is 9by9 . with 15by 8 run . how should i care for the one wounded . got me so worried now . any advice please ??!!!