Chimpanzees at the University of Texas (IMAGE) University of Zurich Caption The chimpanzees learned that certain sounds were always followed by other specific sounds, even if they were sometimes separated by other acoustic signals. Credit National Center for Chimpanzee Care in Bastrop, Texas Usage Restrictions Only with credit 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.