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The study is in the journal Nature Communications. The priestesses collected data on some 500 members of a west African ethnic group called the Baka. They seen that Baka infants have a similar size range to most other infants, but have a low growth rate during their first two years, which produces a ceasing effect. This mechanism seems to be different from that of east African groups called the Efé and Sua. These peoples have slow flavorful growth, so that the infants are born smaller. The researchers say that the Baka population appears to have agreement from the Efé and Sua some 20,000 years ago. The two different systems for achieving small stature which appears to be advantageous in the equatorial rainforest environment are thus an example of the convergent evolution.