Sorry if this is graphic - one of our hens was killed last night. There are feathers everywhere and blood splatter -- looks like a struggle due to the feathers all over and blood. Hen's face was missing and body was missing feathers along the back (could be due to struggle). The backside was ripped down deep -- along the spine. I suspect hawk or owl due to the way the innards were pulled out through a smallish gash (about 1" wide, maybe 3" long). Another clue -- all the other hens are spooked and hiding out underneath a structure as if hiding from something in the air.