Manual laterality in anvil use: wild chimpanzees cracking Strychnos fruits.

@article{McGrew1999ManualLI,
  title={Manual laterality in anvil use: wild chimpanzees cracking Strychnos fruits.},
  author={William C. McGrew and Linda F. Marchant and Richard W Wrangham and H. H. Klein},
  journal={Laterality},
  year={1999},
  volume={4 1},
  pages={
          79-87
        }
}
Wild chimpanzees (Pan troglodytes schweinfurthii) at Gombe National Park, Tanzania, smash open the hard-shelled fruits of Strychnos spp. on anvils of stone or woody vegetation. In this food-processing task, most of the apes show exclusive use of one hand or the other, that is, strong individual hand preferences. Such extreme laterality of manual functioning corresponds to Level 3 on a five-level descriptive model of lateralisation that appears to reflect the increasingly skillful demands of… CONTINUE READING

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