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Geographical distribution ranges for Pan troglodytes subspecies (Hill, 1969; Grubb et al., 2003; Oates et al., 2008, 2009). The ranges are colour coded: yellow for P. t. verus, orange for P. t. ellioti, pink for P. t. troglodytes and turquoise for P. t. schweinfurthii. The question mark indicates a dispute about the chimpanzees inhabiting the area west of the Niger River in Nigeria and their phylogenetic grouping with either P. t. verus or P. t. ellioti.
