In ancient — but still human — times, animals lived at Mungo that challenge the imagination. Called Megafauna, they were giant animals of many kinds. There were kangaroo-like beasts that weighed over 200kg (440lb) and could reach three metres (10 feet) to eat leaves off the tree tops, called now Procoptodon goliah. There was the Diprotodon, the biggest marsupial known to have lived on this island.