My guess is that the poster's chicken either is molting, or got chased and harassed by an inexperienced predator (or a dog). Or both! Something that grabbed feathers, but did not damage the skin. For the owl story, I agree owls don' t intentionally pluck chickens- their prey items are usually small (rats, mice, gophers, ect), and they are dawn/dusk/night time predators- not usually overlapping with the average chicken. If a farmer found an owl stuck in a coop- and an alive and defeathered chicken- there was probably alot of flapping and flailing, scared owl and scared chicken- but probably not much intentional plucking. They don' t have the feet for that.
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Maybe it was a freak one time thing, but the farmer shot the owl because he found it in the coop. Not just a story, it is fact. they may not always do this, but one did this one time.