Test Conditions (IMAGE) Max-Planck-Gesellschaft Caption Test conditions: A mature male orangutan carries out the tasks. Credit Image: Knut Finstermeier, MPI for Evolutionary Anthropology 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.