Ok I have a yellow lovebird got him since a baby feed him and transformed into a beautiful bird very tamed...its one year old ...since 4-5 months ago it stared to pluck all feathers right now has no feathers on his chest ...bare skin....loosing on its head imposible to pluck feathers above his head..sometimes scratches a lot in the head....nothing has change in my home ,same place,food,no new pets just him,my daughter, my wife and myself always play with him...its the same bird I mean from his behavior doesn't look sad or retreated...please help! use to fly around my apartment,imposible now...no feathers to sustain flight...