Have you ever seen a giant wombat in Australia? Of course not because they don't exist anymore. But once upon a time they did, along with other giant animals. Megafauna literally means BIG animal.
Mega + Fauna = Big + Animals. Any mammal weighing more than 100 pounds (45 kilograms) are considered as megafauna. Excluding dinosaurs however because they're in a category of their own. Long after the extinction of dinosaurs, megafauna roamed Australia. Giant flightless birds, hippo-sized diprotodonts and the world's largest ever land-dwelling lizards make up the megafauna, which went extinct around 30-50,000 years ago.
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