Protrusion on an ant raft (IMAGE) University of Colorado at Boulder Caption Fire ants form a protrusion from an ant raft. Credit Credit: Vernerey Researcher Group at CU Boulder Usage Restrictions Use with 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.