CatBat

CatBat is a boss in Wario Land 4 that resembles (as the name suggests) a grotesque mix of cat and bat. CatBat has a huge gaping maw and floats much like a ghost, spewing forth spiky little monsters by which to attack Wario with. The room in which CatBat manifests also periodically summons large tidal waves - though Wario can easily bypass these hazards. Just like the other bosses once defeated CatBat will disappear in a cloud of smoke.