We lost one of our older hens today (3 years old). She was laying on the side in the coup and was unable to stand up. We have 40+ chicks that are about two months old. We have about a dozen that have really droopy wings and some are unable to stand. One chick died. The run is quite muddy and we just laid down some hay to help counter that. Our outside temperature is about 7C. The chicks stay in the coup outside at night and are out in the run during the day. We have brought the droopy-winged chicks inside. The chicks don't seem to want to drink although they have water available. The chicks are eating. The chicks are kept separate from the laying hens. The hen that died was a Barred Rock and most of the affected chicks are Barred. The chicks came from our own eggs that we incubated.