One of my hens repeatedly puts its head to the ground and walks backwards for about six paces until it hits something. it appears to be totally involuntary. From what I’ve Googled, it seems to be a condition that can occur in a lot of breeds and other related species. Does anyone know what causes this condition? Or know what I can do to cure it? And can I breed from this bird without risk of its offspring having the same condition? (It is my best looking bird). It’s diet is the same for 13 other hens, it is at the bottom of the pecking order, and it has been going on for about six months without sign of improvement.