I have 11 hens and one bantam roo sharing two coops in an enclosure of about 70'x30'. They all get along and everyone is happy. The four RIR's are approximately 18 months old and I am aware that they will molt this fall. However, one of them, Reba, lost all her neck feathers about 3-4 months ago. And for quite some time prior to that, her neck feathers started looking odd. Now her comb is drooping as well. She behaves perfectly fine, and doesn't appear ill. She still lays daily. I regularly douse their coop, bathing spots and nesting boxes with DE to prevent mites/lice. I just want to make sure that their isn't something horrifically wrong with her that will ultimately wipe out my little flock. I would welcome everyone's comments and/or suggestions re: Reba's naked neck and droopy comb. Thank you all very much!