Mumbo's Skull is Mumbo Jumbo's hut. In Banjo-Kazooie, it only consists of one room, with a pad that Mumbo transforms you with. However, in Banjo-Tooie, his hut was remodeled with two floors, with Mumbo at the top. The new skull sometimes changes appearance to match the world's theme. For example, since the skull in Witchyworld is in the Inferno, it is red and has devil horns. In Hailfire Peaks, since the skull is on the fire side, it has a volcanic appearance. In Grunty Industries, the skull is made of grey metal. And in Cloud Cuckooland, there are two skulls - one red and one blue; depending on which skull is entered first, either skull may contain either a Jinjo and the world's boss, Mingy Jongo, or a Minjo and Mumbo himself.
In Banjo-Kazooie: Grunty's Revenge, it is known as Mumbo's Pad.
In Banjo-Kazooie: Nuts & Bolts, Mumbo no longer lives in a skull. His skull makes a small appearance, as he put a large wooden version (it's flat) of it in front of his mechanic shop in Showdown Town's town square. His skull also makes an appearance as one of the many objects in Banjoland.