Early mammal: Gobiconodon from Mongolia (IMAGE) University of Oxford Caption Early lineages of mammal like this large Gobiconodon from Mongolia outcompeted the ancestors of modern mammals in the time of dinosaurs. Credit Art by Corbin Rainbolt. 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.