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Flexibility of Wild Chimpanzee Nut‐cracking Behavior Using Stone Hammers and Anvils: an Experimental Analysis
Author(s) -
Sakura Osamu,
Matsuzawa Tetsuro
Publication year - 1991
Publication title -
ethology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.739
H-Index - 74
eISSN - 1439-0310
pISSN - 0179-1613
DOI - 10.1111/j.1439-0310.1991.tb00249.x
Subject(s) - hammer , flexibility (engineering) , transect , nut , troglodytes , cracking , ecology , engineering , biology , mathematics , structural engineering , materials science , statistics , composite material
Nut‐cracking behavior in wild chimpanzees ( Pan troglodytes verus ) using natural stone hammers and anvils was studied through transect survey and experimental analysis at Bossu, Guinea. Transect surveys revealed that hammers were significantly smaller than anvils, although the role division was not strict. Analysis of experiments such as separating nuts and stones found under palm trees revealed the chimbanzees' flexibility in tool use. The behavioral patterns of transportation, discrimination, and the substitution of tools were not stereotyped. This flexibility appears to stem from the chimpanzees' understanding of the relationship between tools and referents, i.e. the function of tools.