Diprotodon ("pair of forward forward-facing teeth") was the largest marsupial that ever lived and the largest land mammal known from Australia. Herds of these shaggy herbivores roamed across semi-arid Australia, with the largest males reaching weights of over 2.5 tonnes. They were among the most spectacular casualties of the megafaunal extinctions of the Late Pleistocene.
I remember breaking my back assembling the Diprotodon skeleton that is currently under the glass in the Diamonds to Dinosaurs gallery at the WA Museum.