What is it about Australia to be leading in this catagory? I'm really curious.
>>This compares to the somewhat harder to live with lion, elephant and rhino which are mostly still around.<<
Well this is a little misleading since if humans had their way they would be extinct. They only exist because they are protected and because people think they are cool. Compatable animals tend to get pushed around a lot more by humans since we don't notice we are infringing on them until it is too late.
Likewise since most of Australia is uninhabitable for humans and most animals, the three people per square is misleading as well. Take the population density of habitable regions and this number goes way up.