Hello all. I am a new member but have used the site before to get information when I first considered getting chickens. I'm not sure what to do about my problem so I'm hoping someone has some info. Yesterday afternoon I let my rooster and hens out to free roam in the yard as I usually let them out every morning and they roam all day and go back into their run and coop in the evening. Yesterday afternoon I let them out and left home to run some errands. When I came back, I found my Polish hen in the back yard, she had been killed. This is my first instance of this as I am new to backyard chickens and I have no idea really what happened. There were feathers everywhere and she was a mess. All of her from the neck up was bloody and her feathers had been pulled out and even her eyes were gone. The only thing I saw when I went in the yard was a medium sized bird flew up into a tree as I entered the yard. It was so far away I couldnt even see what kind of bird. We are in a rural area and I know there is also a family of fox that travels the area. It really kinda freaked me out and I was glad my kids werent the ones who went to check the chickens this time. My other hens were very quiet and seemed to be hiding in the large bamboo and one behind my greenhouse. The rooster was on the other side of the fence like he had run into the woods. I have kept the remaining chickens in the run today but I dont know what to do really since I didnt see what happened or what got her. Any advice or insight would be appreciated.