We've had our chickens now for 9 months and haven't lost not one to a predator. My son goes down to the coop this morning to gather eggs as usual and find one of our laying brown leg horns dead in the coop headless. He found her head on the outside of the fence. What would pull her head off through the fence then just leave it? I would have expected a raccoon to eat it or do they just kill and leave?