Young Aka Pygmy woman receives Tetanus

The Aka or Bayaka are a nomadic Mbenga pygmy people who live by hunting. Although the Aka people call themselves BiAka, they are also known as Babenzele in Western Central African Republic and Northwest Congo (RPC).

They live in a variety of terrains in southwestern Central African Republic and northern Congo (Brazzaville region), in 11 different ecological zones of the Western Congo Basin. They are a related, but distinct, people from the Baka people of Cameroon, Gabon, northern Congo, and southwestern Central African Republic.

The BiAka have a high predominance of the L1 genetic haplotype, which is believed to be the most divergent human dNA haplotype. It is believed that the modern human ancestor developed in the East Africa area, where the Efé (and other Mbuti) and the Hadzabe of Tanzania also exhibit the L1 haplotype. During a period of "interglacial optimum" weather, the Sahara became lush and green, allowing easy migration along its southern border. It is theorized that during this period, migration of early man occurred from the Eastern Congo basin to the Western Congo basin. The BiAka therefore represent some of the most distinct existing modern humans.