I'm sorry to hear about your loss, GracieGirl. The same exact thing happened to Feather Feet, my Buff Brahma (my avatar image) two days ago. The consensus is that the predator was a hawk since the attack occurred in broad daylight (11am) and like you, I also found poor Feather Feet with her head missing. My other girls are still very skittish and would flap their wings and run at any sudden movement I accidentally made, especially from above them. I didn't let them out of their run yesterday until I got home from work so I could keep an eye on them. The girls are avoiding the woodsy part of the property where Feather was attacked, which is good. They have been doing their usual pecking and scratching, foraging for food. I gave them all a healthy portion of grapes and blueberries (their favorites) along with some scratch and mealworms in their run to encourage their appetites. At dusk I saw a couple of them eat from the feeder that is inside the coop. I agree with the others: if they seem frightened, keep them in the coop (unless your run is also covered), especially if the hawk is still around. Try feeding them some of their favorite treats to jump start their appetites. Let them free range some, but under supervision. They should come around soon after this traumatic event has passed. Good luck!