I have this male cockatiel for almost 3 years. and he has been so aggresive to me even thou I treated him very kind and generously. he starts so plucking feathers once he sees me, he doesnt letme get near the cage and he tries to bite me in any possibilty. one thing I know is he was abused in pet shop until I got him. I kinda feel desperate at this point, waiting for your suggestions