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Table S1. Dates and geographical location of chimpanzee surveys and days spent in each forest region, and chimpanzee contact rate per forest region

Table S2. Human evidence per kilometer walked by study region [see Hicks et al., submitted and Hicks 2010 for more details]

Table S3. Box-plots of minutes of contact time split by forest region, for (A) individual chimpanzees and (B) chimpanzee groups

Table S4. Box-plots of the individual contact durations (minute) by age/sex class (AF = adult females, AM = adult males, AU = adults unknown, JF = juvenile females, JU = juveniles unknown, SM = subadult males, SU = subadults unknown, UU = unknown)

Table S5. First reaction to observers (%) by category of apes (N = 196)

Table S6. Total reactions per contact (%) by category of apes, N = 196

Table S7. Chimpanzee contact types by forest region (%). Data are entire contacts categorized as naïve, ignore, nervous, immediate departure, intimidation, or undetermined (based on the majority of reactions shown by the chimpanzees). At Bili, for the seven contacts in which the chimpanzees reacted in equal numbers with two different behaviors, the two categories of behavior each received a score of 0.5. Contact types are from Morgan and Sanz [2003]

Table S8. A comparison of contact-types and encounter rates of human evidence found in the different study regions.

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