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Role of mothers in the acquisition of tool-use behaviours by captive infant chimpanzees

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Abstract

This article explores the maternal role in the acquisition of tool-use behaviours by infant chimpanzees (Pan troglodytes). A honey-fishing task, simulating ant/termite fishing found in the wild, was introduced to three dyads of experienced mother and naïve infant chimpanzees. Four fishing sites and eight sets of 20 objects to be used as tools, not all appropriate, were available. Two of the mothers constantly performed the task, using primarily two kinds of tools; the three infants observed them. The infants, regardless of the amount of time spent observing, successfully performed the task around the age of 20–22 months, which is earlier than has been recorded in the wild. Two of the infants used the same types of tools that the adults predominantly used, suggesting that tool selectivity is transmitted. The results also show that adults are tolerant of infants, even if unrelated; infants were sometimes permitted to lick the tools, or were given the tools, usually without honey, as well as permitted to observe the adult performances closely.

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Acknowledgements

This study was financially supported by the Ministry of Education, Science, and Culture, Japan (Grants 07102010, 12002009, 10CE2005, and JSPS-2926). We would like to thank N. Bacon, C. Douke, M. Hayashi, T. Imura, Y. Mizuno, N. Nakashima, G. Ohashi, C. Sousa, A. Ueno, and M. Uozumi for their assistance in data collection, and T. Matsuzawa, M. Tomonaga, and M. Tanaka for their support and suggestions. Thanks are also due to K. Kumazaki, N. Maeda, and other staff at the Primate Research Institute of Kyoto University for their support in conducting the experiment and for taking care of the chimpanzees. The experiment reported here adhered to the 1986 version of the "Guide for the Care and Use of Laboratory Primates" of the Primate Research Institute of Kyoto University. The experiments described complied with the current laws of Japan.

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Correspondence to Satoshi Hirata.

Electronic Supplementary Material

The following five video clips have been prepared in MPEG1 format using a personal computer running Windows 98.

Video S1 An example of “Observe”. An infant (AYUMU) observes his mother (Ai) using a knobbly plastic string as a tool to fish for honey

hirata1.mpg (1.8 MB)

Video S2 An example of “Rejection”. A mother (Chloe) rejects her infant’s (CLEO) reaching for and trying to lick a tool (rubber tube) by pushing the infant’s head back

hirata2.mpg (1.2 MB)

Video S3 An example of “Allow to lick”. A mother (Ai) allows her infant (AYUMU) to take away and lick a tool (knobbly plastic string)

hirata3.mpg (1.5 MB)

Video S4 An example of “Give”. A mother (Ai) gives the tip of a tool to her infant (AYUMU). The infant reaches for the tool, but the mother licks it herself, then the mother gives the tip of the tool without honey to the infant. The tool touches the mouth of the infant, but the mother soon withdraws it

hirata4.mpg (1.4 MB)

Video S5 A successful insertion by an infant. An infant (PAL) inserts a rubber tube into a honey hole and succeeds in obtaining honey

hirata5.mpg (1.8 MB)

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Hirata, S., Celli, M.L. Role of mothers in the acquisition of tool-use behaviours by captive infant chimpanzees. Anim Cogn 6, 235–244 (2003). https://doi.org/10.1007/s10071-003-0187-6

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  • DOI: https://doi.org/10.1007/s10071-003-0187-6

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