In anthropology, pygmy peoples are ethnic groups whose average height is unusually short. The term pygmyism is used to describe the phenotype of endemic short stature (as opposed to disproportionate dwarfism occurring in isolated cases in a population) for populations in which adult men are on average less than tall.
The term is primarily associated with the African Pygmies, the hunter-gatherers of the Congo Basin (comprising the Bambenga, Bambuti and Batwa).
The terms "Asiatic Pygmies" and "Oceanic pygmies" have been used to describe the Negrito populations of Southeast Asia and Australo-Melanesian peoples of short stature. The Taron people of Myanmar are an exceptional case of a "pygmy" population of East Asian phenotype.
Etymology
The term pygmy, as used to refer to diminutive people, derives from Greek πυγμαῖος pygmaios via Latin (sing. ), derived from πυγμή – meaning a short forearm cubit, or a measure of length corresponding to the distance from the wrist to the elbow or knuckles. (See also Greek πῆχυς pēkhys.) In Greek mythology the word describes a tribe of dwarfs, first described by Homer, the ancient Greek poet, and reputed to live in India and south of modern-day Ethiopia.
The term pygmy is sometimes considered pejorative. However, there is no single term to replace it. In French-speaking Africa, they are sometimes referred to as autochthon (autochtone), referring to 'native' or 'indigenous'. Many prefer to be identified by their ethnicity, such as the Aka (Mbenga), Baka, Mbuti, and Twa. The term Bayaka, the plural form of the Aka/Yaka, is sometimes used in the Central African Republic to refer to all local pygmies. Likewise, the Kongo word Bambenga is used in Congo. In parts of Africa they are called Wochua or Achua.
Short stature
Various theories have been proposed to explain the short stature of pygmies. Some studies suggest that it could be related to adaptation to low ultraviolet light levels in rainforests. This might mean that relatively little vitamin D can be made in human skin, thereby limiting calcium uptake from the diet for bone growth and maintenance and leading to the evolution of the small skeletal size.
Other explanations include lack of food in the rainforest environment, low calcium levels in the soil, the need to move through dense jungle, adaptation to heat and humidity, and as an association with rapid reproductive maturation under conditions of early mortality. Other evidence points towards unusually low levels of expression of the genes encoding the growth hormone receptor and growth hormone compared to the related tribal groups, associated with low serum levels of insulin-like growth factor 1 and short stature.
Africa
African Pygmies live in several ethnic groups in Rwanda, Burundi, Uganda, Democratic Republic of the Congo, Republic of the Congo (ROC), Central African Republic, Cameroon, Equatorial Guinea, Gabon, Angola, Botswana, Namibia, Madagascar, and Zambia. There are at least a dozen pygmy groups, sometimes unrelated to each other. The best known are the Mbenga (Aka and Baka) of the western Congo basin, who speak Bantu and Ubangian languages; the Mbuti (Efe etc.) of the Ituri Rainforest, who speak Bantu and Central Sudanic languages, and the Twa of the African Great Lakes, who speak Bantu Rundi and Kiga. Most pygmy communities are partially hunter-gatherers, living partially but not exclusively on the wild products of their environment. They trade with neighbouring farmers to acquire cultivated foods and other material items; no group lives deep in the forest without access to agricultural products. It is estimated that there are between 250,000 and 600,000 Pygmies living in the Congo rainforest. However, although Pygmies are thought of as forest people, the groups called Twa may live in open swamp or desert.
Origins
Expansion to Central Africa by the ancestors of African Pygmies most likely took place before 130,000 years ago, and certainly before 60,000 years ago. A commonly held belief is that African Pygmies are the direct descendants of Late Stone Age hunter-gatherer peoples of the central African rainforest, who were partially absorbed or displaced by later immigration of agricultural peoples, and adopted their Central Sudanic, Ubangian, and Bantu languages. This view has no archaeological support and ambiguous support from genetics and linguistics.