Hello all! I have had my 4 hens for a little over a year. This is their second winter together. However, the alpha hen (Voldemort, a Black Star) is missing feathers around her head, neck, and back/belly. This worries me because it is winter in Maine. I am not sure I she is suddenly being picked on, or how to stop that, or if it is a disease. I have separated her until I discover the problem... Thanks!