I came home today to find one of my RIRs killed in the run. It's neck and head was stripped of feathers and head mostly gone. There was no breach in the security of the fence or door. What happened here? Was it killed by a flying predator? Was it killed by one of it's own? After I removed it, the others came to the area and began to peck and scratch where it was laying, eating it's blood. I find this death very strange and suspicious. Does anyone have any ideas?? Thanks for the help. -Brian.