I'm trying this here in hopes of getting some advice...tried the emergencies thread and am getting nowhere. ONe of my 6 month old RIR girls has been falling over, off balance, and literally acting drunk since yesterday afternoon. She's eating, drinking, roosting, pooing normal, but is not able to stand upright for more than a few seconds. She cocks her head to the left side...the same way she keeps tipping over. She even laid an egg today! (on the coop floor under the ramp where she's been taking refuge)...so I can rule out being egg-bound. She has no sign of injury & none of the other birds show signs of being ill. None of my birds have been vaccinated for Mareks. They get Purina Layena crumbles with free-choice oyster shells. Water has ACV added and is changed/cleaned regularly. My thoughts are vitamin deficiency? stroke? Hit her head? Inner Ear infection? This seemed to have come on suddenly yesterday afternoon when she was out free-ranging. She looks "dizzy" too. I'm open to any and all suggestions & hoping she snaps out of it soon!