Caribou in Northern Ontario (IMAGE) Wildlife Conservation Society Caption Better known as reindeer during the holiday season, caribou play a vital role in the health of northern ecosystems. Credit L.S. Vors Usage Restrictions Use with photo credit. One-time usage only. License Licensed 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.