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Figure 1. Different hand grips used by the dominant hand during bonobo nut-cracking. Bonobo precision grips hold small and medium-sized hammerstones: (a) Pc1 grip; (b) Pc2 grip; (c) Pc3 grip. Novel precision finger/active palm grips typically used for small and medium-sized hammerstones: (d) PcApm4; (e) PcApm5; (f) PcApm6; (g) PcApm7; (h) PcApm8; (i) PcApm9.
Power grips were most commonly used to hold all hammerstones: (j) Pw1; (k) Pw2; (l) Pw3; (m) Pw4; (n) Pw5; (o) Pw6 (photographs by J. Neufuss).