Mind you, I do not approve of the man using his mouth BUT I do wholeheartedly approve of him playing with the bird in such a wonderfully interactive manner - THIS is the ultimate goal of teaching parrots tricks: entertain THEM - not us and, most certainly, not for our vanity or desire to show off with a YouTube video of what our birds do.
https://www.msn.com/en-xl/europe/other/ ... i-BB125vk1