Giant Ripper Lizard
Little is certain about the giant Ripper Lizard, because only a few fossils have been found, but they show that quiet recently Australia was dominated by a gigantic carnivorous lizard called Megalania. Megalania was a relative of the Komodo dragon, which still lives on an few islands near Indonesia. The Komodo is known as a man eater, its suliva contains toxic bacterians, it bites its prey and wait until it dies by cause of infection. Being a close relative, Megalania did probably the same. The Giant Ripper Lizard however was twice as big as the Komodo dragon.
Megalania was 5,5 meters long, had bigger teeth and claws then the dragon, and fed probably on large marsupials such as the now extinct Diprotodon.