A monkey wakes up next to her group mates as the sun rises. Throughout the day, she needs to make a number of decisions. Who should she forage with? Who should she cooperate with in order to chase away unfamiliar monkeys? Are there any particular individuals that she should avoid interacting with? When she is not foraging or defending her territory, she can usually be seen grooming another individual. However, choosing whom to groom presents yet another decision she needs to make. On this particular day, she may even end up deciding with whom she is going to mate. This is a complex but important decision, requiring the selection of a high quality male among many others based on a set of physical characteristics. All these myriad decisions require her to know the individuals in the group, recognize specific individuals among others, and remember past interactions with group members.
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