Hi all, I have a duck acting very strange. She puts her neck in an S shape and moves it back and forward in rapid succession while chattering loudly, she is also very fearfull of anyone. There a couple of reasons why I think this might be happening firstly another one of our ducks and a chicken were killed by a cat, secondly I think she might have hit her head on a rock when we were putting her over a segregation fence. She is now the only duck we have and she is in with five hens. Any ideas to try and help would be much appreciated.