Woke up to my first chicken death today... She has been completely fine until yesterday... One of the kids got in the chicken run yesterday and my rooster tried to flog him. SOOOO I'm not sure if this would have caused her to stress?? Afterwards, she seemed to cough? And continued to cough randomly throughout the evening and made a racket in the coop all night. I woke up this morning to find her dead. Everyone else is fine except for one lady who is being very lethargic. I'm hoping this isn't a disease.. But I'm not sure what to do? Any suggestions?