simosthenurus occidentalis is a species of sthenurine marsupial that existed in australia during the pliocene, becoming extinct in the pleistocene epoch around 42 000 years ago. a large herbivorous biped that resembles large kangaroos, the species had a heavier body than the modern roo. the structure of the skull and teeth indicates it consumed tough vegetation, resembling koalas and panda bears, and is referred to as a short-faced kangaroo.