Serengeti Dung Wildlife Graphic (IMAGE) Washington University in St. Louis Caption Some of Africa's most biologically diverse wildlife hotspots can trace their origins to a cycle of soil enrichment that begins with dung deposited in the livestock corrals of ancient herdsmen. Credit Stephen Goldstein/Washington University Usage Restrictions None 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.