Thylacoleo carnifex
Thylacoleo carnifex, the largest carnivorous Australian mammal known, may have hunted other Pleistocene megafauna like the giant Diprotodon. Thylacoleo was one of the first fossil mammals described from Australia, discovered not long after European settlement. It may have been an ambush predator or scavenger, and had enormous slicing cheek teeth, large stabbing incisor teeth (replacements for the canine teeth of other carnivorous mammals) and a huge thumb claw that may have been used to disembowel its prey.