Oyster (2 of 3) (IMAGE) U.S. National Science Foundation Caption Oysters build their reefs -- such as this one on the South Carolina coast -- using a specialized cement, one that differs in composition from their shells, as well as from other marine organism adhesives. Credit Zina Deretsky, National Science Foundation; photos by Jonathan Wilker, Purdue University 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.