20 million years ago - Australia's splendid isolation
Ravenous 'roos - Riversleigh Killer Kangaroo
Unlike modern kangaroos, the Riversleigh Killer Kangaroo was a flesh-eater. It was probably able to prey on animals as large as itself. It gripped its prey with its powerful arms and ripped through the meat with its strong jaws and sharp teeth.

Riversleigh Killer Kangaroo.
Illustration: A Musser © Australian Museum.
Skull of a Riversleigh Killer Kangaroo Ekaltadeta ima. Early to middle Miocene. Riversleigh, Queensland
Photo: S Humphreys © Australian Museum.