Final answer:
The claim that Kanzi the bonobo created sharp flakes by throwing rocks is false. While primates exhibit advanced tool use, such as fishing for termites with twigs and using stones as hammers, the intentional production of sharp flakes by throwing rocks is not documented.
Step-by-step explanation:
The statement that Kanzi the bonobo learned to produce sharp flakes by throwing rocks to the ground is false. Primates like chimpanzees and bonobos have shown a remarkable ability to create and use tools, a trait once considered exclusively human. The famous chimpanzee researcher Jane Goodall documented chimpanzees making tools by stripping twigs to fish for termites, a clear demonstration of problem-solving and tool use in non-human primates. Similarly, chimpanzees have been observed sharpening sticks to use as spears and using stones as hammers. However, there is no evidence to suggest that Kanzi or other bonobos have produced sharp flakes in the manner described by the question, attributing the accidental outcome of throwing rocks to the ground to a deliberate act of tool-making. The tool-making practices of other hominids, such as Homo sapiens during the Upper Paleolithic, did involve the creation of sophisticated tools like blades from various materials, emphasizing a significant evolution in tool technology over time.