It was fine at first and I put my hand between the cage bars and it did nothing. But now it's crest is all the way flat and when I put my hand in the cage towards it, he tries to bite me. I've done nothing to it. I've just been sitting next to it while on my ipad
BQ: what does it mean when it's crest is all the way up and half way up? How can I recognise cockatiel behaviour
См. статью: Why is my male cockatiel angry?