This is part of my design of a mechanical bird with detailed instruction at
https://www.instructables.com/Moving-White-Phoenix-With-3D-Printed-Parts/

I am not good at designing the head of the bird, so I remixed this excellent design https://www.thingiverse.com/thing:4856305
Print out the remixed head file and remove support carefully.

The design for the rest of the bird is at

https://www.thingiverse.com/thing:6448305