I've lost three hens to a night-time predator over the past several weeks. I live in South Jersey. Rural area and am surrounded by acres upon acres of woods. My run is surrounded by a 4' fence. I have no roof net. The predator kills the bird, carries it to the corner of the run, and, eats almost everything. The remains consist of a skeleton with feathers, legs and a head. Any ideas on what creature is responsible?