Isn't there a topical spray for this - something like "pick no more"? I think it' something like Bitter Apple but for birds. I don't have much experience with this, but I did have an issue when the flock was bored. I had to keep them locked up last April die to a persistent fox. Once they could free range again, the issue disappeared.
That's one of the things I tried and it didn't work! And this bird only picked when everyone was more active. It was winter and when it was nice enough to be let outside, I guess she felt happy enough to enjoy her favorite bad habit, but only on one bird. Another bird was starting to copy her, on just this one victim. I tried separating too.
On another bird I tried putting feather snacks out (I save all feathers from butchering), and she ate those, and still picked at other birds' rumps. This same bird also started attacking a broody muscovy hen, and mating with other hens.
I've heard it's more common in breeds like Leghorns.
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