One of my white Silkies acted really weird this morning. It make some strange movements with the head left and right ( it almost looks like a stroke to me or something wrong with the nerves?). The other thing is, it looks like the chicken need to vomit. It stretches the chest and throuht and it looks it needs to throw up. I seperated it now, cause I have no idea what that could be. Please I need some suggestions. And I am afraid my other 4 birds from the same cage could be infected too. Really need some help with this.