Almost 40 years ago, Australian palaeontologists found the fossils of an ancient species of kangaroo, approximately 20,000 to 50,000 years old. Strong, stout and substantial in size, the fossil species featured the same powerful legs, long feet and lengthy tail quintessential of kangaroos today. What was truly surprising about the fossils, some would say, was that they were found outside of Australia, on the nearby island of New Guinea.