Chimp Tool-Assisted Hunting (IMAGE) Iowa State University Caption Jill Pruetz says the environment and social tolerance may explain why savanna chimps, particularly females, are more likely to hunt with tools. Credit Image courtesy of BBC Usage Restrictions Must include photo credit to BBC 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.