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. 2015 Jul 22;5:12456. doi: 10.1038/srep12456

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Mean tool length in cm (SD) across chimpanzee study sites according to army ant type (epigaeic vs. intermediate) and dipping location (nest vs. trail). Red dashed line indicates the mean tool length for epigaeic nests. N indicates the number of dipping tools for each site. *MWU test: P < 0.0001. References for each site: Fongoli²⁴, Bossou¹⁷, Taï¹⁹, Gashaka²²,²³, Bili (N. Uele)³⁶, Kalinzu M (This study), Kalinzu S (This study).