My 9 wk Black Australorp has been having episodes where she'll repeatedly stretch her neck some, open her beak then shake her head. It's not constant and she seems to be breathing normally...so far. She's been sick for a week with what I believe was Cocci and so I started treating for that last Wednesday with Sulmet; she started the beak behavior on Thursday. Her Cocci symptoms are going away (she's still sleeping a lot but her droppings are pretty much normal again, her energy is picking up, she's eating, drinking, scratching in the yard) but the open beak-head shake is maybe getting worse. I found something online about Gapeworms which listed neck stretching and head shaking as a symptom but then I found something else that said Gapeworm was very rare in chickens. I'm hoping someone here can help: could it be Gapeworm? I'm in Central Texas. This is my first time owning chickens and I just got them a week ago Saturday so everything is new to both me and my hen. She's one of three - the other two are a 13 wk Barred Rock and RIR, both of them seem completely normal and happy. Thanks for the help.