Chimpanzees across Africa include some meat in their diet1. In most communities where chimpanzees have been studied over the long term, primate prey is apparently preferred over other animal prey, with red colobus monkeys (Piliocolobus badius) comprising the most common monkey species eaten2. At Fongoli, Senegal, it is likely that chimpanzees have never had access to red colobus monkeys at this hot, dry and open site, although the range of red colobus monkeys (P.b. temminckii) in Senegal and adjacent countries in West Africa has diminished3. Fongoli chimpanzees are currently not sympatric with red colobus, although they eat vertebrate prey of various types, including a number of primate species.