I found this mostly eaten bird in my backyard. The backbone and pelvis were intact, but all of the flesh was gone as was the head. It has very long talons. I appears to be a medium sized bird, and I suspect it is a Cooper's Hawk. Any thoughts? It has very long talons. My chickens free range back here, and I have two roosters with them. I also have a Great Pyrenees who looks after my chickens. I don't know what ate on it, but am wondering if it might have been the chickens or mice, since the feather were relatively intact. The tail feathers were behind the rest of the carcass a few feet, but were intact. Do you think my rooster might have killed it? None of my birds show any sign of trauma.