Hi from the UK I'm not new to keeping to Chickens, however I would like some advice on missing tail feathers as I don't know if its mites (never experienced them before), moulting or something else? Only one Hen is affected, I haven't seen her or any other hens pulling the feathers out or any feathers in the run or coop. The skin looks normal it's not bloody or red and she's been like it for about a week. She seems ok in herself, eating, drinking, still laying and going about her business as usual. If it is mites can you see them?