Diprotodons lived during the Pleistocene epoch appearing about 1.6 million area ago. A fossil Diprotodon now at Coonabarabran Visitor Centre, excavated from Tambar Springs, has been dated to 33,000 years and one near Burra in South Australia to 40,000 to 44,000 year ago. Various dates are given for extinction, the most recent estimated date of final extinction is 20,000 years ago.
The Diprotodon preferred semi-arid plains, savannahs and open woodlands, and is generally absent from hilly, forested coastal regions which were the preferred habitat of the related Zygomaturus. Present-day coastal Diprotodon sites were further from the coast in Pleistocene times.
During the nineteenth century eight Diprotodon species were identified based on size or minor differences in single specimens from widely separated places. Recent work has concluded there was a single species (Diprotodon optatum) of Diprotodon with very wide distribution and with males significantly larger than females. Diprotodons have been found in many sites across Australia but have not been found in southwest Western Australia, in the Northern Territory or in Tasmania (but has been found on King Island)
¶ Wikipedia at http://en.wikipedia.org/wiki/ accessed 25 November 2009.
¶ "Australian Museum - Diprotodon optitatum" at http://australianmuseum.net.au/Diprotodon.optatum
¶ Regional Council of Goyder at http://www.goyder.sa.gov/site/page.cfm?u=301 - accessed 25 November 2009