Length: 13 - 19 mm.
Bubas bison is native to Europe, where it occurs in Mediterranean regions. In Australia it has established in WA, SA, Vic and southern NSW.
The beetle is shiny black with the small males having two horns on each side of the head. Large males have longer horns on the head and an additional pronounced horn on the pronotum. Females have two ridges on the head and a ridge on the pronotum.
The species is unlikely to be confused with any other introduced to Australia.
Several brood masses, each containing two eggs, one at each pole, are buried in a nest 20 – 40 cm below the dung pad. Beetles are active from autumn to late spring, with flight occurring at dusk and dawn.