I have a banty hen who is about 6 months old. She came over here from the neighbors so I don't know much about her or her breed. In the last week or so her neck has started to twist so much that her head is now upsidedown most of the time. She obviously can't eat or drink so will die but what concerns me is what's wrong with her. I've looked in my chicken health book but aside from "twisted leg", I can find nothing that fits. The rest of my flock seem ok (they are not banty chickens). I have old ones and young ones of various breeds. Anyone have any ideas?