Finding Mob Skeleton Skulls(not the actual heads) When Using a Brush

Archeology sites will need to have many purposes in order for people to find an interest for actually excavating them so here's an idea of mine. When you brush away, you can have a chance to uncover a mob's skeleton skull. Now we don't know if we are getting these sites in the Nether so the skulls that you can only find are overworld generated mobs. These skulls would be a unique way to decorate builds like witch huts and halloween houses so I hope we can get these in the game.