Feather-picking and self-mutilation behaviors are common in psittacine birds. These behaviors are best defined as stereotypic behaviors or obsessive compulsive disorders. ...
Why do birds hurt themselves?
WHY DO BIRDS SELF MUTILATE? Feather plucking or self-mutilation are not really a disease, per se. These behaviors are more of an indication that something is wrong in the bird's life. Any deficits in their care causes the bird to experience stress.
Why does my bird keep biting itself?
While many bird owners misinterpret birds' biting as an act of aggression, this behavior is often a sign of stress and fear. Birds will frequently bite and lunge to try to protect themselves when they are afraid. ... Birds that suddenly start to vocalize less may be stressed, unhappy, bored, or ill.