The couple two times I've lost mature large hens to raptors (most likely Red Tails, maybe possibly Cooper's or Sharp Shinned) they ate the heads and crops before leaving. I hear they will come back later, but I put bodies in my composter before that happened.
I also had a young pullet vanish, and I suspect a hawk flew away with her.
I also had a young pullet vanish, and I suspect a hawk flew away with her.