Comparison of Modern and Fossil Mammal Communities (image) University of Utah Share Print E-Mail Caption This is a comparative analysis of fossil (gray shaded) and modern (light gray shaded) mammal communities. The study found little overlap between the types of mammals that thrived in the past versus in modern East African ecosystems. Credit J. Tyler Faith adapted figure from Faith et. al., PNAS 2019 Usage Restrictions Non commercial, with attribution Share Print E-Mail 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.