This paper, building on the evidence of Bantu words for sheep, develops the hypothesis that livestock-keeping was introduced to southern Africa by people speaking Central Sudanic languages. It is suggested in particular that livestock may have been spread south from western Tanzania, one branch dispersing directly to southern Africa and another eastward to the Indian Ocean seaboard. It should be possible to test this hypothesis further as our knowledge of the languages involved, especially the Central Sudanic languages, grows.