(IMAGE) Max-Planck-Gesellschaft Caption Baby bonobo with its mother: In this chimp species higher levels of thyroid hormones during adulthood influences social behavior and cognitive skills. Credit Credit: MPI f. Evolutionary Anthropology/C. Ziegler 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.