I'm reading that owls will just take the head. I don't know whether the double bite mark fits, though. https://www.thehappychickencoop.com/which-animal-bites-the-heads-off-chickens/
I'm Nancy from the Phoenix, AZ area. We've had chickens for several years, as well as ducks and geese. We bought chicks at the feed store, including Auracana, Buff, Barred Rock and a couple of black breeds, but were eventually inundated with cross-breeds starting with a neighbor's visiting...