Like the title says my 3 year old quaker parrot became suddenly aggressive with me today and I don't know why. I had him for 3 years and he was always really sweet with me but would be more aggressive with strangers. Today when I went to say hello to him he lunged at my head and started bitting me. I'm not sure what happened to cause the sudden behaviour change because he was normal yesterday. Not even with strangers is he this aggressive he just tries to stay away from them so I'm really confused as to what happened.