Ive has somthing very fermiliar happen to me. I had my flock of 7 button quail in a cage on the ground. When i went out one morning 6 of my buttons were dead. Some missing legs, wings, some were even half eaten. 2 of them were decapatated but the heads were right next to them. I never found out what had gotten them. I always suspected it was a rat or mouse. I had my fav. one Bologna left but i think he died from lonlyness =[