We lost in one month 6 out of 9 chickens. We think it is a possum but have yet to find or trap the killer. Now the 3 left are locked in a chicken run/ house combo close to the house. No problems, but the chickens want to free range. The chickens were killed near the front fence as if the predator pulled just the head through and left the body behind. So annoying. You would think the dog would scare it away, but I think it happens too fast.