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Raking it in: the impact of enculturation on chimpanzee tool use

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Abstract

Recent evidence for different tool kits, proposed to be based upon culture-like transmission, have been observed across different chimpanzee communities across Western Africa. In light of these findings, the reported failures by seven captive juvenile chimpanzees tested with 27 tool use tasks (Povinelli 2000) seem enigmatic. Here we report successful performance by a group of nine captive, enculturated chimpanzees, and limited success by a group of six semi-enculturated chimpanzees, on two of the Povinelli tasks, the Flimsy Tool task, and the Hybrid Tool task. All chimpanzees were presented with a rake with a flimsy head and a second rake with a rigid head, either of which could be used to attempt to retrieve a food reward that was out of reach. The rigid rake was constructed such that it had the necessary functional features to permit successful retrieval, while the flimsy rake did not. Both chimpanzee groups in the present experiment selected the functional rigid tool correctly to use during the Flimsy Tool task. All animals were then presented with two “hybrid rakes” A and B, with one half of each rake head constructed from flimsy, non-functional fabric, and the other half of the head was made of wood. Food rewards were placed in front of the rigid side of Rake A and the flimsy side of Rake B. To be successful, the chimps needed to choose the rake that had the reward in front of the rigid side of the rake head. The fully enculturated animals were successful in selecting the functional rake, while the semi-enculturated subjects chose randomly between the two hybrid tools. Compared with findings from Povinelli, whose non-enculturated animals failed both tasks, our results demonstrate that chimpanzees reared under conditions of semi-enculturation could learn to discriminate correctly the necessary tool through trial-and-error during the Flimsy Tool task, but were unable to recognize the functional relationship necessary for retrieving the reward with the “hybrid” rake. In contrast, the enculturated chimpanzees were correct in their choices during both the Flimsy Tool and the Hybrid Tool tasks. These results provide the first empirical evidence for the differential effects of enculturation on subsequent tool use capacities in captive chimpanzees.

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Acknowledgments

This paper is dedicated to the memory of Kermit and Bobby, both magnificent chimpanzees, and Jane, a charming capuchin, for their tragic sacrifice that will, in turn, allow so many more chimpanzees, monkeys, and other animals to have the life they deserve, while under compassionate stewardship. We would like to thank Stephany Harris, Amanda Bania, April Truitt, and the staff at the Primate Rescue Center for assistance in data collection. We would also like to thank Thomas Nygren and Guangiojian Zhang for their assistance in data analyses, and John Opfer, Dorothy Jackson, and Chris Gibbons for their insightful comments on an earlier draft of this manuscript.

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  1. Department of Psychology, The Ohio State University, 209 Psychology Building, 1835 Neil Ave., Columbus, OH, 43210-1222, USA

    E. E. Furlong, K. J. Boose & S. T. Boysen

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  1. E. E. Furlong
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  2. K. J. Boose
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  3. S. T. Boysen
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Correspondence to S. T. Boysen.

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Furlong, E.E., Boose, K.J. & Boysen, S.T. Raking it in: the impact of enculturation on chimpanzee tool use. Anim Cogn 11, 83–97 (2008). https://doi.org/10.1007/s10071-007-0091-6

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  • DOI: https://doi.org/10.1007/s10071-007-0091-6

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