Chimpanzee Studies

Modern chimpanzees use tools, and recent research indicates that chimpanzee stone tool use dates to at least 4300 years ago. A recent study revealed the use of such advanced tools as spears, which Common Chimpanzees in Senegal sharpen with their teeth, being used to spear Senegal Bushbabies out of small holes in trees. Prior to the discovery of tool use in chimps, it was believed that humans were the only species to make and use tools, but several other tool-using species are now known.

Source: Wikipedia