(IMAGE)

Max-Planck-Gesellschaft

Caption

Mysterious stone piles under trees are the work of chimpanzees.

Credit

MPI-EVA PanAf/Chimbo Foundation

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.