It is 50,000 years ago in the insular continent of Australia. The giant monitor lizard Varanus priscus (once known as “Megalania”) is taking a stroll alongside the river when a hungry saltwater crocodile (Crocodylus porosus) leaps out of the water to attack it. During the Pleistocene epoch, both of these massive predatory reptiles would have ruled as the apex predators of their respective habitats. However, whereas the giant monitor would eventually go extinct, the saltwater crocodile still haunts the waters of northern Australia (as well as Southeast Asia and Melanesia) in the present day.