My chickens have been dying one by one and we can't figure out what is causing it. We finally have one with more symptoms she has ruffled feathers head tilts back with constant shaking cheaping alot not eating or drinking. she also acts like she is having siezures. She seems to be breathing fine though. please help New symptom she twisted her head completely around and upside down. Everyone of them we have found deceased already have been the same way heads comepletely twisted around and upside down.