Seals on Ice (IMAGE) Utrecht University Caption The Caspian Sea is the natural habitat of the Caspian seal, whose pups can only survive on ice. The parts of the sea that freeze over will diminish by 98% over the course of the 21st century. Credit No credit necessary Usage Restrictions None 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.