The term Australian megafauna refers to a number of large animal species in Australia,
often defined as species with body mass estimates of greater than 45 kg or equal to or greater than
130% of the body mass of their closest living relatives, that lived during the Pleistocene Epoch.
Most of these species became extinct during the latter half of the Pleistocene,
and the roles of human and climatic factors in their extinction are contested.
There are similarities between prehistoric Australian megafauna
and some mythical creatures from the Aboriginal Dreamtime.