Caribou (IMAGE) University of Cincinnati Caption University of Cincinnati assistant professor Joshua Miller holds an antler shed by a female caribou in the Arctic National Wildlife Refuge. By conducting an isotopic analysis of the antler, researchers can track the animal's migration over the previous year. 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.