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She bites the tops off of her feathers, showing the fluff underneath. I have been able to postpone this activity by extra humidity near her cage and play area. Worse during mating season. Any one else have this problem? Suggestions?
She may be plucking in anticipation of laying an egg. Make sure she gets 12-14 hours of sleep a night, no soft warm foods, and petting only on the neck.
That's great that more humidity helps. Hopefully it is seaonal, but I would definitely have a vet check that there are no underlying physical problems since Feather Destructive Behaviour in Pionus is not common.