The word "pygmy" is sometimes thought to be pejorative (an insult). It is, however, the only word that is used to call all African Midgets.[4][5] The word Bayaka is sometimes used in the Central African Republic to refer to all local Pygmies. In the Congo Basin, pygmies are called the Kongo word Bambenga.
Name
The name "pygmy" comes from the Greek word πυγμαίος (pygmaios). This word was derived from (came from) the word πυγμή which is the length between a person's elbow and knuckles. The Latin word Pygmaeus (pl.pygmaei) came from this older Greek word.
There are a number of theories to explain why pygmies are so short. It has been proved that their height is hereditary, and is passed on from parents to children.[7] It may have evolved because of the low ultraviolet light found in rainforests, where many pygmies live. This would mean that the pygmies would make less vitamin D in their skin. Vitamin D helps the body absorb calcium, which is important for bones to grow. Since the pygmies would get less calcium, they would have smaller bones and skeletons.[8]
There are other explanations for why pygmies are so short. Some explanations are:
there is less food in the rainforest
there is less calcium in the soil, so the food has less calcium
it is easier for smaller people to move in thick jungle
Some research shows that the genes for the growth hormone receptor and growth hormone are found much less in pygmies than in related tribes. These genes are important for humans to grow tall.[9]
There are a number of Pygmy groups living in Africa. The three best-known groups are the Mbenga, Mbuti, and Twa groups. Each big group includes several tribes that have their own language.
The Mbenga people, sometimes called the Ba-Mbenga, live in the western Congo basin. The Mbenga include the Aka people, who speak the Aka language. The Aka live in the Central African Republic and the Republic of Congo. The M-Benzélé people, or "western Aka", and the Ba-Sese people, "eastern Aka", are also related.
↑"Darwin's Children". The Economist. London: The Economist Newspaper Limited. December 13, 2007. Retrieved 2011-06-26.
↑Hewlett, Barry S. (1996). "Cultural diversity among African Pygmies". In Kent, Susan (ed.). Cultural Diversity Among Twentieth-Century Foragers: An African Perspective. Cambridge, England: Cambridge University Press. pp. 215–244.
↑O'Dea, JD (1994). "Possible contribution of low ultraviolet light under the rainforest canopy to the small stature of Pygmies and Negritos". Homo: Journal of Comparative Human Biology. 44 (3): 284–7.
↑Bozzola, M (Nov 2009). "The shortness of Pygmies is associated with severe under-expression of the growth hormone receptor". Mol Genet Metab. 98 (3). Travaglino P, Marziliano N, Meazza C, Pagani S, Grasso M, Tauber M, Diegoli M, Pilotto A, Disabella E, Tarantino P, Brega A, Arbustini E: 310–3. doi:10.1016/j.ymgme.2009.05.009. PMID19541519.