Healthy and starved urchins (IMAGE) University of California - Santa Cruz Caption A healthy purple sea urchin from a kelp forest has large yellow gonads (top image), whereas one from an urchin barren is starved (bottom), with little nutritional value for a sea otter. Credit Photos by Michael Langhans Usage Restrictions For use only with news coverage of this research 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.