Prehistoric GiantsIn the Footsteps of Giants, the second in the Museum Victoria Nature series, introduces the reader to the amazing world of Australian megafauna in the Pleistoceine era. Imagine an Australian landscape in which Diprotodon optatum roamed this rhinoceros sized diprotodon was probably the largest marsupial ever to exist. There was also the awesome Megalania prisca, an enormeous goanna like carnivore that weighed at least 600 kg and grew to 5. 5 metres