Diprotodon is the largest marsupial ever to have evolved. It lived during the Pleistocene (2.6 million to 12,000 years ago), when the Australian continent was becoming increasingly arid. Diprotodon fossils are found throughout Australia, except Tasmania. It was a member of the sub-family diprotodontinae. They seem to have coped better with increasing aridity during the Pleistocene, possibly surviving until as recently as 25,000 years ago. They would have witnessed the first human colonisation the continent, though whether humans contributed to the demise of the megafauna in Australia as they clearly did on other continents - is hotly debated.