“…Nevertheless, it shows that donkeys were present in the region in the first millennium BC, in both the Loita Plains of southwestern Kenya and on the southern side of Lake Eyasi in northern Tanzania. The latter area marks the most southerly known extension of Pastoral Neolithic settlement and it is thus to it, or areas nearby, that we need to look for the origin of those groups that introduced cattle, sheep, ancestral forms of the Khoe language family and, perhaps, pottery, to Africa south of the Zambezi in the last few centuries BC (based on dates from Leopard Cave, Namibia, Spoegrivier, South Africa and Toteng, Botswana; Sealy and Yates 1994;Robbins et al 2008;Pleurdeau et al 2012). Gifford-Gonzalez (2000 has demonstrated that a number of serious infectious diseases, including trypanosomiasis, probably handicapped the southward spread of domestic livestock, especially cattle, into East Africa and between East Africa and southern Africa.…”