I free-range my chickens on our acre during the day, but close them in their moveable coop at night. I just went out to lock them in and found one of my 2 month old sex links dead in the roost. She was just running around today. It's not hot. It's been raining and they love the extra worms. One of her eyes was glazed over and the other one looked bloody, but there seems to be no other visible injuries to her body. I don't know if she was attacked. I know a traditional predator would have eaten her if it hadn't gotten frightened away, but I also think that would be more likely to happen at night. We have a cat who has happily lived with the chickens up until now--(and maybe she still is)--but she did have kittens a week ago. Perhaps her protection senses are in overdrive. Could she have injured Belle and then Belle went back to the roost to die?