Megafauna: What Killed Australia's Giants?

Australia was once home to extraordinary animals known as Megafauna. These giants lived here for millions of years - but what became of them? A team of scientists re-open this Palaeolithic cold case.

Australia was once home to a group of extraordinary animals known as Megafauna. These giants lived here for millions of years, but in a blink of time, they disappeared. So what became of them?