The study is published in Journal of Human Evolution.
It is for the first time that body sizes of human that lived 1.5 and 2.5 million years ago are compared.
By using tiny fossil fragments a method is developed to calculate the height and body mass of early human beings.
This method is developed by the researches from the Universities of Cambridge and Tubingen (Germany).
The study is performed on three species Homo habilis, Homo rudolfensis and Homo ergaster (the working man) that lived in Africa between 1.5 and 2.5 million years ago.
Co-author Jay Stock, a human evolution expert from the University of Cambridge said, “What we’re seeing is perhaps the beginning of a unique characteristic of our own species – the origins of diversity.”
Variation appears to be regional. Kenyas koobi were 6 feet tall while the South africas were 4’8” tall.
Stock said, “Basically every textbook on human evolution gives the perspective that one lineage of human’s evolved larger bodies before spreading beyond Africa. But the evidence for this story about our origins and the dispersal out of Africa just no longer really fits.”