Our eight month old Ameracauna hen has started making a strange motion with her mouth. My initial thought was a respiratory infection and treated with Tylan. When that didn't work I tried de-worming (flock was due anyway) with Rooster Booster Multi Wormer. Still, no improvement. She does fairly well, but not quite as active as before the illness. I have attached a link to a video...if anyone has any advice I would be extremely grateful.