The Agta in Camp near the Beach (IMAGE) Arizona State University Caption This 1965 photo by Thomas Headland shows the Agta sitting in the shade of dried-leaf-thatched huts. The Agta, an indigenous Philippine group, are one of the hunter-gatherer societies whose co-residence patterns were studied by an international team of anthropologists led by Arizona State University professor Kim Hill. By examining census data on recent hunter-gatherers, the researchers determined that the biological success of humans likely stems from the species’ ancestral social structure. These findings are reported in the March 11 edition of the journal Science. Credit Thomas Headland Usage Restrictions With proper photo credit. Not to be made downloadable. 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.