Stone Tools for Nut-Cracking
Chimpanzees at Bossou are known to have a rudimentary form of lithic technology. They use a pair of stones as hammer and anvil to crack open the hard shell of oilpalm nuts (Elaeis guineensis) to consume the edible kernel within (Fig. 7.1). There are many oil-palm trees in the foothills surrounding the village of Bossou. Nutcracking can be observed throughout the year. Field experiments have clarified many facets of this complex tool-use behavior (Matsuzawa 1994; Biro et al. 2003; Carvalho et al. 2009, see also Chaps. 15–18). This chapter focuses on stone-tool use and summarizes its importance in terms of comparative cognition. The topics covered include laterality, critical learning period, observational learning, possession, culture, planning, meta-tool use, and emergence of lithic technology.
KeywordsHand Preference Stone Tool Observational Learning Elaeis Guineensis Young Chimpanzee
The present study was financially supported by the following grants: MEXT #16002001, #20002001, JSPS-HOPE, gCOE-A06-D07. I wish to thank all my colleagues, students, and Guinean collaborators who have helped me understand stone-tool use in chimpanzees. I am most grateful to Takao Fushimi, Noriko Inoue-Nakamura, Dora Biro, Claudia Sousa, Misato Hayashi, and Susana Carvalho for all their efforts toward gathering longitudinal data on nut-cracking at Bossou.
Nut Cracking - Gaku Ohashi and Tatyana Humle (WMV file 13968 kb)
- Fushimi T, Sakura O, Matsuzawa T, Ohno H, Sugiyama Y (1991) Nut-cracking behavior of wild chimpanzees (Pan troglodytes) in Bossou, Guinea, (West Africa). In: Ehara A, Kimura T, Takenaka O, Iwamoto M (eds) Primatology today. Elsevier, Amsterdam, pp 695–696Google Scholar
- Goodall J (1986) The chimpanzees of Gombe: patterns of behavior. Belknap Press of Harvard University Press, CambridgeGoogle Scholar
- Hayashi M, Mizuno Y, Matsuzawa T (2004) PrimatesGoogle Scholar
- Matsuzawa T (1994) Field experiments on use of stone tools by chimpanzees in the wild. In: Wrangham RW, McGrew WC, de Waal FBM, Heltne PG (eds) Chimpanzee cultures. Harvard University Press, Cambridge, pp 351–370Google Scholar
- Matsuzawa T (1997a) Phylogeny of intelligence: a view from cognitive behavior of chimpanzees. IIAS Rep 1997:17–26Google Scholar
- Matsuzawa T (1997b) The death of an infant chimpanzee at Bossou, Guinea. Pan Africa News 4:4–6Google Scholar
- Matsuzawa T (1999) Communication and tool use in chimpanzees: cultural and social context. In: Hauser M, Konishi M (eds) The design of animal communication. MIT Press, Cambridge, pp 645–671Google Scholar
- Sugiyama Y (1991) Habitat isolation and population structure of wild chimpanzees in and around Bossou, West Africa. In: Maruyama N, Bobek B, Ono Y, Regelin W, Bartos L, Ratcliffe PR (eds) Wildlife conservation: present trends and perspectives for the 21th century. Japan Wildlife Research Center, Tokyo, pp 32–35Google Scholar