Invasive Snail (image) University of Washington Share Print E-Mail Caption An Atlantic oyster drill snail feeding on a juvenile Pacific oyster. The drill is one of four species of invasive marine snails in Washington state. 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.