Video: Kanzi now makes his tools, just as our ancestors may have made them, two-and-a-half million years ago -- by holding the rocks in both hands, to strike one against the other.
Video: Kanzi laver nu værktøj, muligvis ligesom vores slægtninge har lavet dem, to og en halv million år siden -- ved at holde en sten i hver hånd, og slå dem mod hinaden.