Tomales Bay Oyster Habitat (IMAGE) University of California - Davis Caption This oyster habitat in Tomales Bay, California, contains high densities of invasive oyster drills, snails that prey on native oysters. Credit Brian Cheng/UC Davis Usage Restrictions Provide credit. 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.