I have 5 hens. The one missing the feathers on her back first started losing her feathers a few months ago. The rest of her looked normal. I assumed she was starting to molt. They are exactly a year old. This week she really started looking rough. The feathers on her neck are sparse and frizzled. Now 4 out of 5 of the other hens are losing feathers and developing patches of thinning. They are their usual active selves. I've never seen them attacking one another. They are all laying normally. Eating and drinking normal. Is this some type of mite issue or are they attacking each other when we aren't around? I can't find any mites on them.
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