This Northern Cardinal rig can easily make a wide range of different Cardinals such as the Red male, Yellow male, female and everything in between. Also settings to make the feathers appear younger as well as older.

This rig very similar to my other bird asset https://blendermarket.com/products/stylized-realistic-crow-rig 

The overall controls are the exact same at the exception of the legs and the feather colors controls. The body feathers on this cardinal are simple hair particles. Very easy to turn this into a different small bird as well if you know your way around blender enough.