Little recent survey work has been carried out over much of the chimpanzeeâs range, and so population estimates are crude. The most recent estimate of total population size is 172,700 to 299,700 (Butynski 2003). Approximately 6,400 to 9,600 eastern chimpanzees were estimated to occur outside the DRC, with about 5,000 in Uganda. DRC was estimated to have 70,000 to 110,000. Central African chimpanzees were estimated to number 70,000 to 116,500. In the west, P. t. verus is patchily distributed and number between 21,300 and 55,600 with the greatest number estimated to be found in Guinea (Kormos et al. 2003); P. t. ellioti is the least numerous taxon with a total population of less than 6,500 individuals remaining (B. Morgan and J. Oates pers. comm. 2006). The only relatively large and secure population of P. t. ellioti is in Gashaka-Gumti National Park in Nigeria, with an estimated population of up to 1,500 (Oates et al. 2003).
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