While you will not see one hopping down the main street of Sydney, we do guarantee that you will see a kangaroo. The kangaroo is unique to Australia and one of our most easily recognized mammals. There are more kangaroos in Australia now than when Australia was first settled. Estimates suggest around 40 million -- that's 2 kangaroos for every 1 Aussie. You can even come home with a photo of yourself petting a kangaroo at Steve Irwin's Australia Zoo or Wild World in Cairns.