Pleistocene Rewilding (image) University of Chicago Press Journals Caption A long-term vision of Pleistocene Rewilding -- a massive Ecological History Park of North America with free-roaming elephants, lions and other large animals that went extinct 13,000 years ago in North America. Credit Illustration by Carl Buell. Usage Restrictions None 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.