We live in a suburban neighborhood in NE Oklahoma. We have a fenced backyard. We have a coop, which we left open because our hens free range and we naively assumed predators wouldn't be as big of an issue in the city. Last night, something got all six of our hens. The hens were in the coop last night. I found four bodies in our yard, pulled about 100 feet from the coop, toward the fence. Three of the four bodies have their heads and necks missing. One of the three headless bodies has a hole in the abdomen. One body has no visible damage. Two of the hens are unaccounted for, but I found evidence of their feathers in other areas of the yard, so I assume they're gone too. We've had extra cold temps and recent snow. I found small prints in the snow, but I can't really ID them. Any ideas what we're dealing with? What would kill all six hens, pull them from the coop and eat just their heads? Thanks.