Analysis of information sources in references of the Wikipedia article "מודלים אבולוציוניים של שיתוף מזון" in Hebrew language version.
[...] Parker and Gibson (1979) suggested that food sharing arose as a secondary adaptation from tool use. [...] Sharing patterns thus created could generalize to other relationships. (Why chimpanzees [...] have not taken food sharing further in the hominid direction is not clear.)
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