The caption for figure 4 incorrectly references  when it should reference  (Roffman I, Savage-Rumbaugh S, Rubert-Pugh E, Ronen A, Nevo E. 2012 Stone tool production and utilization by bonobo-chimpanzees (Pan paniscus). Proc. Natl Acad. Sci. USA 109, 14 500–14 503. (doi:10.1073/pnas.1212855109)). The figure was used with permission from this source.
One contribution of 16 to a discussion meeting issue ‘Homology and convergence in nervous system evolution’.
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