What do you know about Australia? Which country has the longest fence in the world? How about the 2nd largest Greek population? Three times more sheep than people? One word will give it away: kangaroos. Yes, it's the Land Down Under.

Australia is the world's 6th largest country and the only one that’s also a whole continent. But with all that territory, over 80% of Australians live within 60 miles of the coast. Before humans arrived, the continent was home to mega-fauna. If you’d lived there about 46,000 years ago, you’d be dead today. But you would’ve seen 10-foot-tall kangaroos, 23-foot-long goanna lizards, and ducks the size of an adult horse.