I had three hens. They learned how to fly over the top of the run and one of them came up missing. I covered the top of the run with chicken wire and thought they were safe. Then my barred rock came up missing. I did not see any sign of anything getting into their run. Since I was down to one hen I decided to go buy another one. I tried to get her as close to the same age as my speckled sussex that I still have. She pecked at the new chicken a little bit but they were in the run all day together and were laying down in the coop together when I closed it up but I got up this morning to find her dead in the coop. Her head was missing as well as one of her legs. Do you think the Speckled Sussex would have done this. I don't really know how something else could of got into the coop. I don't know what to do. I read it is best to have more than one chicken but I don't want to keep spending money on more chickens if she is just going to kill them.