I have a chocolate orpington hen that is a little over a year old. She has been having constant diarrhea for months. She is still active, eating & drinking. She does not itch all the time, so I don't think it's mites. I tried Corid for 5 days and it did not relieve it. I have seperated her, within the "playground" but that seems to be stressing her out more. Any suggestions?