Day Brown writes

It looks like North Africa had the jump on it with herding 25kya,
but it also looks like maybe overgrazing started out the Sahara.
That, and the indigeneous hunting tribes drove all the herders out
of business except what we now know as the Masai.

The masai moved from the north in historic times, about 1500 IIRC.
The original population was hottentot or bushmen, both hunter gatherers.

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Oz
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