Use of Tools

By them both.
There's a sculpture trail, entitled Chimps are Family by Gillie and Marc, at More London at the moment. Bit more about it here.

"FANTA Female age 13.
Wild Chimp Tool Use. 

Chimpanzees use and manipulate objects as tools, a skill which was originally thought to be distinctly human. This discovery shocked the scientific community and  made us re-evaluate what it is to be human. Here, a chimp uses a stick to fish for termites."