Described in 1964 by Ginsburg, F. australis is one of the earliest recorded ornithischian dinosaurs. Like other ‘bird-hipped’ dinosaurs, Fabrosaurus possessed a predentary bone at the tip of its lower jaw. Its teeth were small and pointed, and were used to grind plant material. Fabrosaurus was a biped with short forelimbs, and a long tail to provide good balance.