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Experimental test of cultural transmission of tool use. Alternative techniques for food extraction (a, turn-and-stab; b, lift-and-slide) were seeded in single individuals in groups B1 and B4. Graphs show differential spread of the two techniques across a first group and thence to further groups who were able to witness the methods used by neighbouring groups [43]. Bars represent the proportion of each technique shown by each chimpanzee, arranged in order of skill acquisition.
