Rock Hyrax Middens (IMAGE) University of Copenhagen - Niels Bohr Institute Caption This is one of the rock hyrax middens, from south-west Africa, used in the study to reconstruct past changes in precipitation. Credit Credit: Brian Chase Usage Restrictions Credit: Brian Chase 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.