Eastern Spinner Dolphin (IMAGE) NOAA National Marine Fisheries Service Caption The Eastern Spinner Dolphin is distinguished by its triangular dorsal fin and uniform gray color Credit NOAA - PRD Southwest Fisheries Science Center 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.