Parrots can develop a condition called “chronic hormonal behavior.” This is when the parrot is hormonal out of the normal breeding season. These birds become so emotionally and physically uncomfortable with being unable to procreate that they start behaving aggressively toward others and even toward themselves.  There are a number of steps that you can take at home to reverse this condition. Hormonal related plucking is reversible in many cases, however, it is best to prevent it in the first place. Check out the bird supplies.com hormonal parrots series for support. Type hormonal in the search bar to learn how to support your hormonal parrot.