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Observed versus expected tool-assisted hunting frequency in chimpanzee age–sex classes at Fongoli, Sénégal. Expected frequencies are calculated by multiplying the % total hunting frequency by the % of that age–sex class comprising the average chimpanzee party recorded on days on which tool-assisted hunting was recorded. Based on 302 tool-assisted hunts where age–sex class was known. Adol, adolescent; juv/inf, juvenile and infants.
