Optimisation of Nut-Cracking With Natural Hammers By Wild Chimpanzees

@article{Boesch1983OptimisationON,
  title={Optimisation of Nut-Cracking With Natural Hammers By Wild Chimpanzees},
  author={Christophe Boesch and Hedwige Boesch},
  journal={Behaviour},
  year={1983},
  volume={83},
  pages={265-286}
}
The chimpanzees of the Tai National Park, Ivory Coast, use sticks and stones to open 5 different species of nuts. In spite of an unfavourable availability of the material in the forest, the animals choose their tools adaptively. For cracking harder nuts, they use harder and heavier tools and transport tools more often and from farther away. Some aspects of the evolution of tool-use in primates are discussed. 

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References

SHOWING 1-10 OF 13 REFERENCES
Evidence of tool-using by chimpanzees in the Ivory Coast.
Indirect evidence was collected in Ivory Coast for the use of sticks and stones by chimpanzees to open the nuts of Coula edulis and Panda oleosa . 26 nut-smashing
Tool use by wild chimpanzees in feeding upon driver ants
TLDR
It is concluded that ants may constitute a significant chimpanzee dietary component and that the dipping tools and techniques are relatively stereotyped in form. Expand
The Nut-Crackers - A New Theory of the Adaptations of the Ramapithecinae
TLDR
Members of the Ramapithecinae, the stock which probably gave rise to Pliocene-Recent hominids, had very thick molar enamel, which suggests that they ate hard seeds, nuts, and fruits previously available only to arboreal rodents and forest-floor pigs. Expand
Chimpanzee subsistence technology: Materials and skills
Abstract Beyond reviewing basic data on Primate technological behavior, the aim of this report is to document the nature of chimpanzee technical skills by examining some of the mental as well asExpand
Object manipulation, tool use and sensorimotor intelligence as feeding adaptations in cebus monkeys and great apes
TLDR
This paper proposes a typology for classifying object manipulation and tool use on the basis of criteria drawn from Piaget's Sensorimotor Intelligence Series in human infants, and argues that the evolution of specific object manipulation schemata must be considered separately from the Evolution of intelligence. Expand
L’emploi d’outils par les chimpanzés de l’ouest de la Côte-d’Ivoire
Lors d'une mission dans la région de Tai en Côte-d'Ivoire, que j'ai effectué pour l'Union Internationale pour la Conservation de la Nature, j'ai eu l'occasion de faire quelques observations surExpand
A Note on the Behavior of the Chimpanzee
The nutcrackers — a new theory of the adaptations of the Rama - pithecinae . —
  • Am . J . Phys . Anthro .
  • 1981
Animal tool behavior
...
1
2
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