Caribou (IMAGE) University of Cincinnati Caption By comparing isotopes in shed antlers to the geology of Alaska, researchers can tell where caribou have spent the year feeding. Credit Colleen Kelley/UC 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.