Some vaguely Charizard-looking thing that I doodled up to show how wings work. With dragon/bat wings, it's just a stone's throw from adding a few webbed digits. For bird wings, take away the membrane and add feathers (and keep in mind they have several different feather types on their wings).

Forgive me for my touchpad Paint abomination, I hope this makes some sense and isn't a disgrace to anatomical references.