I had 4 Wyndottes and 6 Black Star hens. Yesterday, I noticed one of my Wyndotte's downy feathers were raggedy looking and her balance was a little off. Today, we found her dead. She had no marks or outward symptoms. The folks at the feed store thought it could have been the heat. We went on and cleaned the coop for good measure. I'm going to get some DE too. Then, I notice today that one of my black star's head looks mangy. Guess I'll get some stuff for that too. Any suggestions? Could my girl have died of mites since the black star is looking mangy?