Dominance (IMAGE) University of Cincinnati Caption Hartebeest bucks spar in the dirt in Uganda's Murchison Falls National Park. Researchers have spent 100 years studying dominance hierarchies. Credit Michael Miller 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.