Territorial Crustaceans (IMAGE) University of California - Santa Barbara Caption These territorial crustaceans use their tails as shields to defend against the explosive punches of their rivals. Credit Patrick Green Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. No derivatives or adaptations of the work are permitted. License CC BY-NC-ND 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.