I have something hitting my flock in the late afternoon/early evening while it is still daylight. We have lost 1-3 chickens in a single day. 1/2 of them have been beheaded, some of the heads are totally missing but some are still laying there. Any thoughts? We have set live traps and the only thing we have caught is possums. I am starting to get really angry!! My flock ranges in a fenced in area. We are planning on running electric tape around the bottom of the fence this weekend. There isn't much else I can do.