hi all - we just walked into our coop to a disturbing scene. (actually my son and his friend that we barely know walked in) We just walked out this afternoon to feed them, and we have 20 dead chickens in the coop (3 are completely missing) none are left. the chickens look completely intact, for the most part. there is a head missing here and there. what would do this? we have an automatic coop door, so it opens and closes with the sun. there are no broken boards, other than a little blood and the dead bodies, everything looks normal. Honestly I don't even know how something would have gotten in, unless it went in during the day and waited for them?