Do you actually see them do it? And where are the feathers locate son their bodies that they're pulling?
I do see some of them do it maybe under wings or could have been a breast feather but usally they have there necks turn backwards. That's why I posted cause one seemed to pull out a decent size feather all other feathers I've seen were small.
Was on the game bird feed there pen us pretty big 15 square feet 11 birds the pic I showed you is there little nesting box . Your right there not alot under wings they actally seem to be messing with there back I just check on this this am there sleeping seems like there gonna be fine. I have fed them the proper protein game bird feed from my local co op. I was doing some reading last night and am taking steps towards making there pen a little more natural envorment for them. Thanks for help any suggestions on what this could be?