We have not had an attack on our chickens since we first got them six years ago. Last night was a first. The predator, I think, tried to dig under the chicken wire first, but couldn't get past the wood that we put at the base of the runs. It looks like it then climbed up onto the roof of one of the runs and slipped in through a small gap in the wire, where two sheets are overlapping. It took the lowest hen, one of our Wyandottes, who was about three to four feet off the ground on her perch. All the other chickens were higher. At first glance, it seems like it went after the breast meat mostly. The head seemed to be attached, but we are going to look at her again to make sure. It did not try to take her with it. I'm guessing its size to be around three to five inches in diameter. I couldn't see any prints, and there was no blood in the coop. Does anyone know what this thing could be? This is a first for us. Thanks.