Data from: Group augmentation, collective action, and territorial boundary patrols by male chimpanzees

Kevin E. Langergraber, David P. Watts, Linda Vigilant & John C. Mitani
How can collective action evolve when individuals benefit from cooperation regardless of whether they pay its participation costs? According to one influential perspective, collective action problems are common, especially when groups are large, but may be solved when individuals who have more to gain from the collective good or can produce it at low costs provide it to others as a byproduct. Several results from a 20-y study of one of the most striking examples...
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