Many moons ago, the legendary Daniel M Lara of Pepe School Land fame released the character Red-Nelb for everybody to use.
With his permission, we have updated it for the latest version of Blender (2.82a) and have rereleased it again, for free.
Here's the direct download link. Have fun!
The video demo will explain all the aspects of the updated rig. The rig is Licensed CC0 - https://creativecommons.org/share-your-work/public-domain/cc0/