Dr Tim Doherty with sand goanna (IMAGE) University of Sydney Caption Dr Tim Doherty, School of Life and Environmental Sciences, the University of Sydney. Photographed here with a sand goanna in Mallee Cliffs, NSW, Australia. Credit The University of Sydney Usage Restrictions For this story only. License Licensed content 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.