Conquering Hero (image) Brown University Caption Just the sight of Carcinus maenas, the invasive green crab, sends marsh grass-eating Sesarma reticulatum crabs running for their lives. The marshes and their grasses slowly recover. Credit Catherine Matassa/Northeastern University Usage Restrictions With credit 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.