A neighbors chicken who visits our 2 and gives us green eggs was injured. Don't know what happened, thought she was a goner. Put her in our henhouse where she rested quietly and laid an egg near where she was resting. Our 2 are not using the henhouse except we lock them there in the evening after they roost on our back railing. Anyway we went away for the weekend and left our chickens out and the injured one and her egg in the henhouse. When we got back the chicken was gone and her egg was broken in two (like I had used it for cooking) and the insides of it were gone. We do not know what kind of predator would break and eat an egg like that. There were no signs of the injured chicken. Any ideas?