My male bird , about 18months old has become vicious just recently…by this I mean when he’s out for his fly (wing not cut) he will stand on a lounge chair hunched up and leap at me beak open and fly at me. I have managed to turn and he lands on my back . Tries to back and then flies off. He will often after talking and whistling to each other .. lunge forward at the cafe bars beak open and his ms to bite . …. now we have the most dreadful time getting him back into his cage . I feel he’s very frustrated and angry . He often squeals a very high pitch single note squeal after the sessions .