 Evidence left by modern humans such as cave paintings are about 73,000 years old. The original inhabitants of southern Africa were the Bushmen (San) and Khoi peoples. Both speak Khoisan languages and hunted, gathered, and traded over long distances. When cattle were first introduced about 2000 years ago into southern Africa, pastoralism became a major feature of the economy, since the region had large grasslands free of tsetse fly.