Mammoth art (IMAGE) University of Texas at Austin Caption A recent study on the butchered remains of a mother and baby mammoth shows that humans lived in North America tens of thousands of years earlier than conventionally thought. Credit National Park Service Usage Restrictions No restrictions. License Public Domain 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.