My wife went out to feed the hens this morning and found one of them showing signs of distress. We have 4 hens, all about 2.5 years old; 3 are RIR and one is a RIR/Buff Orpington cross. So far, they have all been healthy (as far as we know), and not required any special attention. They have plenty of food and water. Now, one of the RIRs has something wrong. She was sitting listlessly in the dirt, her normal red comb is a purplish color, and she has her beak open a lot as though she is trying to breathe or is really thirsty. I picked her up and she flapped around and hopped back on the ground, and slowly walked off. I could not find any physical injury, and there is no sign of a predator getting into their run. She urinated a small amount a minute or so after hopping back on the ground. She seems to be of normal weight (no noticeable change from usual). I will do some searching here on BYC for other threads that may help, but I thought it best to post something right away and see if anyone has suggestions. Thanks in advance for any advice you can offer.