Ant Fight (IMAGE) University of California - Riverside Caption Several Argentine ants surround a single harvester ant during an aggressive interaction. Argentine ants produce chemicals that recruit their nestmates during these encounters. Credit University of California, Riverside Usage Restrictions None 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.