Overview:Australia - 65,000 years ago. Humans travelled out of Africa and reached South-east Asia perhaps as early as 90,000 years ago. Then around 65,000-68,000 years ago a momentous event happened - someone discovered Australia. The ancestors of the Aborigines made a daring sea voyage and set foot on a new and lonely land. Ancient Australia was a land of drought and fire, with a unique fauna dominated by marsupials, reptiles and giant flightless birds. The first Australians shared their home with the two-tonne Diprotodon, the giant short-faced kangaroo and the platypus. Emus and cassowaries were dwarfed by the 'demon duck' Genyornis. Predators like the marsupial lion and the giant ripper lizard, Megalania, stalked the land.