Caribou (IMAGE) University of Cincinnati Caption Alaska's barren-ground caribou have been using the same parts of the Arctic National Wildlife Refuge to give birth to their calves for at least 3,000 years, according to researchers. 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.