Pygmy

Pygmies (singular: Pygmy) refers to various peoples of central Africa whose adults have an average height less than 5 feet (152 centimeters). The term is also sometimes applied to the so-called Negrito peoples of Asia.[1][2][3], and occasionally indiscriminately to individuals of unusually short stature.

Origin

A commonly held view is that the Pygmies are the original inhabitants of the central African rainforest, where they lived for millennia as hunters and gatherers before the arrival of Central Sudanic, Adamawa-Ubangian and Bantu-speaking agriculturists. This view is increasingly coming under challenge as there is no archaeological or biological evidence to directly link modern day Pygmies with the Late Stone Age peoples who lived in central Africa before the agriculturists arrived.[7] [8]
Some scientists assert that it is plausible that Pygmies are simply the descendants of Bantu or Adamawa-Ubangi speakers who took up forest dwelling at some point in the past, considering that genetically there is no evidence that Pygmies are distinct from other Africans. Similarly – linguistically and culturally, Pygmies cannot be considered more distinctive from other central Africans.

Check out this link for more details: http://en.wikipedia.org/wiki/Pygmy