Uninvaded savanna (IMAGE) University of Wyoming Caption On this “pristine” savanna landscape, native ants protect whistling-thorn trees against browsing and destruction by elephants. Credit Pat Milligan Usage Restrictions None License Original 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.