On November 4, 1960, Jane observes David Greybeard and Goliath making tools to extract termites from their mounds. They would select a thin branch from a tree, strip the leaves and push the branch into the termite mound. After a few seconds they would pull out the termite-covered stick and pick off the tasty termites with their lips.
This becomes one of Jane's most important discoveries. Until that time, only humans were thought to create tools. On hearing of Jane's observation, Leakey famously says: "Now we must redefine tool, redefine Man, or accept chimpanzees as humans."