Harvester Ants (IMAGE) Penn State Caption <i>Messor barbarus</i> ants harvesting and bringing wild oat (<i>Avena fatua</i>) weed seeds to the nest entrance. Soldier ants (with large red heads) and smaller workers are visible. Credit Barbara Baraibar, Penn State Usage Restrictions Non commercial use only 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.