I have had chickens roaming freely for a year and half to almost 2 yrs without no issue with predators as they roamed with the goats, but lately since the cold weather has moved in and all the plants have died down they have ventured up onto the mountain a little behind my house away from the goats. Day before yesterday I noticed one of my small roosters were missing when they always come and put their selfs up right before sunset, I always lock the doors when they are all there. Well today a small bantam hen (same breed as roo) went missing, so while counting I discovered one of the 2 remaining small bantam hens from my small breed was acting funny, and then i noticed blood, so I immediately took her inside, I pull her feathers from the are with blood and it looks like a big chunk of meat is gone from her breast. Now also I see corn around it as well or so it looks like corn ( i throw them corn in the day) . Below is a photo of what I could capture with one hand with her not trying to get away. Its much bigger and goes over more than what the photo shows. She acts normal other than the wound. I went into the room i was keeping her in and she had flew up on a sink. What can I do to help her? I'm not sure what predator it is, but my neighbors said they have saw a large hawk flying over past few days , I also have large stock hens.