Approximately 2-yr hen, starting shaking head with chirp about one week ago, but only occasionally. Last night it became constant, shaking-chirp and then crying almost non-stop, all night and still this morning. Unfortunately, or avian vet is booked until Monday and other mobile vet can't make it today. We read this may be upper respiratory or eye infection (eyes look fine) or neurological disease (hope not). Curious of others out there have experienced this. We have not.
