Abstract # 164:

Scheduled for Friday, June 19, 2015 04:30 PM-04:45 PM: (Cascade E) Oral Presentation


TOOL SHARING BETWEEN CHIMPANZEE MOTHERS AND OFFSPRING AT GOMBE NATIONAL PARK, TANZANIA

E. Lonsdorf1, M. Prestipino1, L. Kurtycz2, D. Morgan2 and C. Sanz3
1Franklin and Marshall College, PO Box 3003, Lancaster, PA 17604, USA, 2Lincoln Park Zoo, 3Washington University
line
     Chimpanzees (Pan troglodytes spp) at several study sites have been documented to show tool-assisted foraging of social insects. In particular, “termite-fishing” has been studied in detail at Gombe National Park, and sex differences in the developmental trajectory of the behavior have been well described. Less well known are the interactions that occur between youngsters (ages 0 to 10) and others in the context of sharing tools, which may provide evidence of social facilitation of skill learning. We reviewed an archive of 60 hours of termite-fishing video, and scored all instances (n=174) of an offspring (n=15) attempting to obtain a tool from another individual (usually the mother). Attempts were separated by whether the offspring used begging to request a tool or attempted to take the tool without a request. We found no difference in the percent of requests that were successful according to age or sex, suggesting that mothers were not adjusting their behavior relative to the expertise of the offspring. In addition, comparisons between these data and a comparably scored dataset from the Goualougo Triangle suggest significant differences in mothers’ willingness to share tools between sites. Successful requests for tools are three times more common at Goualougo than at Gombe. Such detailed analyses and intersite comparisons are critically important to our understanding of social learning and behavioral diversity in the wild.