Zeray Alemseged in the Field (IMAGE) California Academy of Sciences Caption Dr. Zeray Alemseged (right), one of the co-authors of the papers, is shown here in the field in Dikika, Ethiopia. Credit California Academy of Sciences Usage Restrictions May only be used in connection with the associated press release. 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.