The bonobo Kanzi makes and uses a stone tool.

Beginning in 1990, Stone Age Institute researchers Nicholas Toth and Kathy Schick, in collaboration with psychologists Sue Savage-Rumbaugh and Duane Rumbaugh at the Language Research Center in Atlanta, Georgia, have been working with African apes, especially bonobos or "pygmy chimpanzees," teaching them to make and use flaked stone tools.