Native Snail (image) University of Washington Share Print E-Mail Caption The Sitka periwinkle, a native marine snail in Washington state, is often exposed on rocks at low tide. Credit Emily Grason/University of Washington Usage Restrictions Photo credit required. Share Print E-Mail 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.