For the first time, a scientific study by Itai Roffman of the University of Haifa, has observed bonobos (an analogous race to chimpanzees) making and using tools to search for food. One bonobo even fashioned a spear from the branches of a tree and used it to threaten Mr. Roffman.

http://www.haifa.ac.il/index.php/en/9-english/1458-bonobos-documented-for-first-time-using-ancient-pre-agricultural-tools-breaking-bones-and-using-spears-as-attack-weapons