There are many possible physical causes of feather destruction, including infections, allergies, malnutrition and diseases such as Psittacine Beak and Feather Disease. Many experts agree that the most common physical cause for feather-plucking is inadequate diet. We believe that both products work well in combination to address the problem. Another physical factor that might contribute to the problem is inadequate humidity or lack of baths, resulting in dry, itchy skin. If your bird's feathers are plucked in areas that only its beak can reach, then it is probably a behavioral problem.
Birds are complex creatures of habit.
Changes in their environment, whether major or minor, can cause stress. Major changes might include a change of homes, including shipping or travel. Moving an introverted bird to a busy, heavily trafficked area of the home have been known to cause problems. Minor changes might include anything from experiencing a severe storm to too close of a wing trim. As mentioned before, boredom can be a factor.