"Man the Toolmaker" is a famous phrase in anthropology. In response to Jane's research, Louis Leakey wrote, "We must now redefine man, redefine tool, or accept chimpanzees as human!" Over the course of her study, Goodall found evidence of mental traits in chimpanzees such as reasoned thought, abstraction, generalization, symbolic representation, and even the concept of self. All these were thought to be uniquely human abilities.