We woke up this morning to one of our chickens fluttering wildly in a circle unable to stand or control movements. She is pulling her head towards neck when startled. Other symptoms include general listlessness, eyes closed, not eating or drinking, very minimal chirps. No other physical symptoms. We separated her from the other chicks, have been giving her a vitamin-electrolyte supplement and are keeping her wrapped in a warm towel which seems to help the flailing. I have no idea what this is or how to treat it--any help would be appreciated.