Anthropology net has an interesting article about pygmy hunter gatherers.
mtDNA shows Pygmy hunter-gathers have a deep ancestry with Bantu farmers
The Pygmy hunter–gatherers of central Africa are an amalgamation of various groups of people that are on average about 4 feet tall. Some genetic and linguistic evidence point to them being direct descendants of hunter-gatherers from the late Stone Age. But that’s about it, there’s not much archaeological evidence to corroborate with this observation.