The Bola Batu babirusa (Babyrousa bolabatuensis) is a proposed species of babirusa from the Indonesian island of Sulawesi. It was first described in 1950 as a subspecies of Babyrousa babyrussa, then the only recognized species of babirusa, and raised to species rank by Colin Groves and Erik Meijaard in 2002. At present the Bola Batu babirusa is only known for certain from subfossil remains from the southern arm of Sulawesi. Based on a single skull from central Sulawesi it has been suggested that babirusas from this part of Sulawesi represent an extant population of the Bola Batu babirusa, and this was followed in the third edition of Mammal Species of the World. However, the most recent major review also found similarities between the central Sulawesi specimen and the Togian babirusa, lead