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This left only two possible Diprotodon species differing only in size with the smaller being around half the size of the larger.According to Gause’s "competitive exclusion principle" no two species with identical ecological requirements can coexist in a stable environment.However, opponents of "late extinction" theories have interpreted such late dates based on indirect dating methods as artifacts resulting from redeposition of skeletal material into more recent strata, Australia has undergone a very long process of gradual aridification since it split off from Gondwanaland about 40 million years ago.From time to time the process reversed for a period, but overall the trend has been strongly toward lower rainfall.The taxonomic implication is that Owen’s original Diprotodon optatum is the only valid species.A single sexually dimorphic species allows behavioural interpretations.In the 1840s Ludwig Leichhardt discovered many Diprotodon bones eroding from the banks of creeks in the Darling Downs of Queensland and when reporting the find to Owen commented that the remains were so well preserved he expected to find living examples in the then-unexplored central regions of Australia. bennettii Krefft, 1873b); based on size or slight morphological differences of single specimens collected from isolated geographic regions.The majority of fossil finds are of demographic groups indicative of diprotodonts dying in drought conditions. Bimodal dental sizes, rather than a continuum of tooth sizes, and identical male and female dental morphology, indicate sexual dimorphism instead of separate species, thus providing strong evidence that the eight species are synonyms for D. Diprotodon superficially resembled a rhinoceros without a horn.

However, the high-resolution chronology of the changes supports the hypothesis that human hunting alone eliminated the megafauna.

The historical classification of Diprotodon consisted of eight species (Diprotodon optatum Owen, 1838; Diprotodon australis Owen, 1844; D. Eight species are described although many researchers believed these actually represented only three at most while some estimated there could be around twenty in total.