From Science News Letter, August 2, 1958

PORCUPINES GNAWED ON STONE AGE MAN’S TOOLS — Razor sharp edges on some of the bone chisels of Middle Stone Age man in Africa were found to have been put there by the needle-sharp front teeth of porcupines, Dr. Raymond A. Dart of the University of the Witwatersrand, Johannesburg, South Africa, reports. But the fact that a magnifying glass showed up the telltale marks of rodent teeth on the Stone Age tools does not mean that ancient man himself did not do the original work in splitting and shaping the animal bones.