Thylacoleo carnifex, known as the 'marsupial lion', was a powerful carnivorous marsupial native to Australia during the Pleistocene epoch. It had retractable claws, robust jaws, and large slicing teeth, making it a formidable predator. Capable of climbing trees, it likely hunted in forests and woodlands.

Thylacoleo carnifex, commonly known as the marsupial lion, is native to Australia. Fossil evidence suggests that it was predominantly found across the mainland, particularly in the eastern and southern parts of the continent.

Thylacoleo carnifex inhabited a range of environments, including open forests, woodland areas, and scrublands. The climate in these regions during its existence varied from temperate to arid, with seasonal variations influencing available resources.

As a carnivorous marsupial, Thylacoleo carnifex occupied the ecological niche of an apex predator. It likely preyed on large herbivorous marsupials, utilizing its robust build and specialized dentition for hunting. Its habitat preferences were influenced by the availability of prey and suitable shelter.