I went out to my coop last night and found one of me hens sick with her eyes closed. Today she is much worse, she is having breathing problems and is near death. I don't know what the problem could be, before last night she seemed perfectly fine. She will be the third chicken I have had die in the past month. One rooster had similar symptoms, but he died slower over several days, another hen I found dead under a tree, just like this hen, she appeared fine before she died. I don't know what they are dying from or if they are dying from the same thing or not. It's only been two weeks since my last chicken died. Does anyone have any idea what the problem could be?