Young male Rosella is tame but gets real aggressie when im doing anything in his cage

by Emily
(Australia)

Hi, i recently hand raised 5 eastern rosellas all were very tame until they started flying so we isolated the youngest so we could care for him and also tame him a lot. He was fine until he also started flying and we were advised to trim wings to help training etc which we did.

Even before we trimmed his wings he was showing some signs of aggression, and hasn't changed. For example if put my hand in his cage to change food/water or even look at him while his in there, he will become agitated and bob his head and fluff his wings out and make a little noises at me if I get to close or anything he will seek my hand out to physically attack. He also bites occassionaly he has latched onto ear lobes and fingers seemingly out of the blue he will jst attack. I love him but am struggling to understand his behaviour. Any help or advice would be appreciated. Thankyou.