are short satured tribe answer is pygmies
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Answer:
The question is controversial. Traditional explanations attribute pygmies' small stature to minimizing caloric requirements and walking in dense forests. However, a new study by researchers at the University of Cambridge suggests that there are some problems with this explanation, and offers an alternative hypothesis.
Human pygmy populations are defined by an average male height of less than 5 feet (155 cm). By this definition, a wide range of pygmy societies exist today in parts of Africa, Malaysia, Thailand, Brazil, and Bolivia – different environments that don’t match the traditional hypotheses for small body size.
Besides the differences within pygmy populations, there are also some non-pygmy populations that face some of the same physical challenges as pygmies but haven’t evolved a short stature. For example, many human populations live in dense forests and experience regular food shortages, and yet these populations have larger body sizes.
Now, scientists Andrea Migliano, Lucio Vinicius, and Marta Lahr have performed a study on two pygmy groups from the Philippines, the Aeta and the Batak, and concluded that there may be a better explanation for pygmies’ short stature. Their study is published in a recent issue of the Proceedings of the National Academy of Sciences.
The researchers point out that one characteristic unique to but common among many pygmy populations is their short lifespan compared to other humans. With this in mind, the researchers suggest that pygmies represent the “fast” extreme of life history strategies, with short stature being a side effect.
Pygmy tribes are found all over the world and represent the largest group of mobile hunter-gatherers. Pygmies are unusual in that their average height is a meager 4 feet, 11 inches. They grow up just like other humans until they become teenagers, at which point they typically fail to undergo a normal growth spurt. Their short stature mirrors their short lifespan, with average life expectancy a mere 17 years.