Ricardo Rocha conducting field work (IMAGE) University of Oxford Caption Ricardo Rocha conducting field work. Credit: Ricardo Rocha. Credit Ricardo Rocha. Usage Restrictions These images are for editorial purposes and must be credited. They must NOT be sold on to third parties. License Original 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.