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. Author manuscript; available in PMC: 2015 Dec 10.
Published in final edited form as: J Hum Evol. 2010 Jan 20;58(3):234–241. doi: 10.1016/j.jhevol.2009.11.008

Fig. 2.

Fig. 2

Sketch of a chimpanzee performing the task for each condition. A) Baseline condition: seated tool use. B) Supported bipedal condition: bipedal tool use while using one arm for support. C) Bipedal condition: completely bipedal tool use without any support. Measurements indicated are d1: 75 cm maximum, d2: 100 cm minimum, h: 2.8 m.