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Volume 481 Number 7382 pp409-540

26 January 2012

About the cover

Hadza women Chausiki and Sislem (with baby) pick ngwilabee berries. The Hadza of northern Tanzania are almost totally cut off from the modern developed world, providing anthropologists with a useful model of an early hunter-gatherer society. A study of Hadza social networks, quantifying their ties to each other and their propensity to cooperate, shows that the main characteristics of modernized networks, such as transitivity and homophily, are observed in the Hadza. In addition, social ties are more likely between individuals with similar levels of public goods game donations, and Hadza camps exhibit high between-group and low within-group variation in cooperation. Taken together, these results provide the strongest evidence so far that these key features of human networks reflect shared ancestry and may have developed at an early point in human history. Photo: Martin Schoeller/August

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