Belle was a 2 month old red sex link. I free-range the chickens during the day. They have been so healthy. I saw her running today. The only visible things I saw wrong with her when I found her dead in the roost was an eye that was glazed over and her other eye was bloody. I suppose it could have been a predator, but it's unlikely. Are there poultry diseases or conditions that have those sysmtoms?