Shaking head “no”

Hi! Brand new bird owner here. I’ve taken in a bird that was relinquished to the zoo where I work. He is about 2 1/2 months old. He does this head shake in the “no” fashion at times. I think he’s literally saying no but I’m new to all this. He will do it sometimes when I take him out of his cage. Once he’s out he’s normally very active and chewing everything. I’ve taken a video to share to make sure this I am on the right track. When he does this, do I just let him stay in the cage? He seems to keep coming back to me tho? Thanks for any help. We are getting to know each other and we are both starting from ground zero.

Oh yea, also when he is on my shoulder he chews on it. Not aggressive just like he chews on everything. He has lots of chew toys in his cage that he chews on constantly too. This boy has some serious energy lol. I shrug my shoulder when he does it. Any other ideas?

Ps. Any idea on how to imbed a video? Lol