I lost 3 - and we are at a loss as to what it is. We found one in the coop (they are closed in at night) last Thursday evening. And then found two more dead on Sunday morning. All three were killed but not eaten. All three had been decapitated (we found one head that was severed close to where it meets the chicken's body). The other 2 heads were not found. We found a small hole (about 8" wide by about 3" deep) going from outside the coop under the sides and into the coop. We had burried the sides of the coop about 10 inches - but the chickens have scratched away much of it...so this weekend we will be putting down cement borders all the way around. We live in central Florida. We have 2 humane traps we are going to put out (we'll probably just be catching cats for the first couple of days - we have five barn cats that were neglected in the "really smart" department... But what do you think might be doing this? See my BYC page for our set-up.