Went out tonight to get something from the coop and found one of my barred rocks on the floor with her head tilted to the side and seeming unable to hold it in a normal position. She doesn't appear sick, no discharge,her neck didn't seem to be hurting her when we felt for injury. She also did a little bit of circling. Any ideas of what this could be? I don't know how old she is, I adopted her within the last year, but she is probably middle age. Any ideas would be appreciated.