We are in Southern California. Is the following a sign of a disease, or infestation? On inspecting our four birds, I find that the rooster and two of the three hens have lots of bare short, feather shafts on their necks. When I inspected them a few weeks ago, they had lovely, normal neck feathers/hackles. Now, their necks don't look good, as a result of a lack of normal feathers/hackles. If anybody writes here that it is moulting, then please also explain clearly what you see during moulting (in addition to feathers on the floor, of course) - because it appears to me that the bottom one-to-two inches of the feather-shafts have not fallen out, whereas the ends of the feather shafts plus the wispy parts have disappeared.