Was Australopithecus a biped or quadruped?

The ancestral mode of locomotion of dinosaurs is thought to be bipedalism. This is supported by the fossil finds of early, basal dinosaurs such as Eoraptor, which lived during the Middle Triassic, over 230 million years ago, and which are clearly bipedal. In fact, bipedalism evolved in the archosaurian ancestors of dinosaurs, and dinosaurs simply inherited it, as did their close relatives. Later on, some dinosaurs evolved quadrupedalism, and this happened independently in several lineages of dinosaurs, such as the ceratopsians (i.e. Triceratops) and sauropods (i.e. Apatosaurus). Some were mostly quadrupedal, but could occasionally assume a bipedal posture (it is believed that hadrosaurids were facultatively bipedal while running, for example). Finally, some retained their ancestral bipedalism - this includes the theropods, and their modern descendants, the birds.