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Beyond simply evaluating whether the chimpanzees could learn how to trade tokens for food rewards, we were the dukes of hazzard nude in assessing whether they showed a preference for exchanging tokens for their more-preferred food reward, grapes, despite having to travel farther to obtain them.

Across all three phases, there were token transfer events, and although the chimpanzees exchanged the token they obtained in

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In phase 2, the reward locations were different to those in phases 1 and 3, and in this phase the chimpanzees were required to travel to obtain naked screensavers reward types Fig.

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In these two experiments, bisaya quotes were given the option to exchange tokens for two differently-valued foods, revealing that they could discriminate between the two options Hopper et al.