Start with an avian vet, not guesswork
Feather damage can have medical causes. A qualified avian vet can look for pain, skin problems, nutrition issues, parasites, infection, reproductive concerns, and other health factors.
Write down the pattern
Track when it happens, where feathers are affected, sleep, diet, bathing, humidity, new products, room changes, social changes, and anything that happened before the behavior.
Check the air and environment
Smoke, aerosols, fragrance, dust, fumes, poor sleep, harsh lighting, unsafe toys, and stress in the room can all matter. Improve the environment while the vet plan is underway.
Add calm work, not chaos
Foraging, chewing, bathing opportunities, training, and predictable social time can help welfare. Keep changes simple so you can tell what helps.
Do not punish or shame the bird
Scolding, collars without guidance, constant interruption, or dramatic reactions can add stress. Stay calm and work from a plan.