I did know that which is why I am convinced my budgies know their names that I've given them and know me by the name I've told them to call me which is 'mama'. I tap my chest and explain what I am about to do involving them ex. "Mama *tap chest* is going to lift the cage *motions lifting the cage* for cleaning! *repeat three times*" If I don't, they get frightened. If I do, they are 100% fine. When I call myself 'mama', they look at me, and/or come close to me, compared to if I just talk they might ignore me. If I say one of their names, the one I named will look at me directly and talk to me.
Birds are funny neat little creatures.
Those Mama codes are interesting and clever! I too am "Mama" and say "Mama loves you" or "Mama go Bye Bye"- never thought of the other ones although when I am about to take out their food bowls and replace with new food I'll put my hand near the bowl first. The video is really good!