I had 5 silkies in their coop. They were shut in at 5:30 a.m. A few hours later MIL comes screaming in the house. There were 2 dead silkies in the front yard. Not a mark on one and the others abdomen was ripped open. Everything still there. Found one hiding and 2 are still missing. No claw marks on door. No holes dug anywhere. Didn't hear anything.\\ There is no way these guys could have gotten out on their own. Any ideas of what could have happened?