Maui really loves mirrors. Do you suppose he's vain? I've had him make up to the camera lens before because I think he could see himself in it.
I think they all do like mirrors. My ringneck certainly loves admiring himself.
Oddly, Maui is the only one of ours that does. We have three 'tiels, and the other two have no interest in mirrors, nor do any of our four budgies. I think it really varies by individual.
I have a bird that looks exactly like this one XD