Sharkatzor

The Sharkatzor is a hidden unit in Age of Empires II, first introduced in the Rise of the Rajas expansion pack. It resembles a cat riding a shark equipped with jetpacks, shooting cows at enemies. As of now, there is no way of accessing the unit, and it was found via exploring the game files after the release of said expansion pack, without even having its own icon (it shares the hawk's icon). However, it is expected to be a cheat unit in Age of Empires II: Definitive Edition, as they have prepared an icon for the unit in the game files.