I have several free range chickens. One hen who is about 3yrs, has not been acting normal for about a month now. She barely eats but does not show a significant loss in weight. She can run when she wants to, but usually just stands around by herself. Not sure if she is laying, but probably not. From what I can tell her poop is kind of orange and watery. Her color and everything else look fine. If you did not know her you would think she is a healthy bird. Like I said, this is going on for about a month now. She gets no better or worse.