Out of the Pouch: Ancient DNA from Extinct Giant Roos (image) University of Adelaide Share Print E-Mail Caption This is the skull of an extinct short-faced kangaroo (Simosthenurus occidentalis). Ancient DNA from these animals reveals they are a highly distinct evolutionary lineage. Credit Mike Lee / South Australian Museum Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.