9 various breed full size hens (1 y/o) were let out of their coop this morning to free-range. I go out to give them scraps and they're nowhere to be seen. Found 1 at the base of a decorative pine tree. Feathers everywhere. No obvious wounds. It had been roosting whenever the struggle took place as there is a freshly broken limb. It has recently snowed (1/2 melted), but I don't see any tracks. My birds free range on 2 acres with natural barriers short of the road. It'll be dark in a few hours and I don't think any will be there to put to bed. Help?