It is well known fact that parrots are one of the most inteligent birds on the planet, but I was surprised nonetheless to see cockatoos do the drumming with use of the leverage as do the humans: the stick. It is simply fascinating!
With woodpeckers however, I am fascinated with the mechanics. How the hell, do they do this very rapid bursts or "drum rolls" on the surface which is very rigid with a single beak...
I would speculate they use a kind of "finger push and pull stick technique" used with some very good kit drummers. They just use beaks and their head and neck muscles instead of fingers and stick I guess.
It can be seen in this demonstration for a few seconds at 2:09 in the video and resembles very much on woodpecker's "drum roll": https://www.youtube.com/watch?v=X8Zfdank3rI