Hi, my name is Juliet and I live in Maleny, Queensland Australia. I have a pen of chickens and every few months one dies. I have lost 2 in the past two weeks and another one appeared to become sick yesterday and will no doubt die within the next 24 hours. They have been wormed and treated for coccidiosis but have no idea as to what is killing them. This same thing has been happening for a couple of years and my local vet said it was probably coccidiosis but as I say they have been treated for that and I have since heard that baby chickens would only contract this disease and not fully grown chickens. The symptoms are lethargy, tail down and crop colour changing. One thing I have noticed in the last couple and with this one is that they shake their heads all the time. I have them penned with 2 ducks and while the ducks are outside during the day, is it possible that the ducks could be frightening them by picking on them to the point where there is no chance of recovery. As you can see I am clutching at straws trying to figure out what the problem is. Most of the chickens I have are ex battery hens which I saved to give them a life and its very upsetting because I feel like Im letting them down. I would appreciate any help or advice please.