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Three cases are described of Cebus a. apella smashing the palm-nut of Astrocaryum chambira Burret in La Macarena National Park, Colombia. It is assumed that the monkeys were attempting to obtain food from these nuts in the form of endosperm, palm-nut milk, and/or insect larvae. The exploitation of this abundant food resource by C. appella and not by any of the other seven sympatric primate species may give them a competitive advantage. This circumstance could partially account for the numerical superiority of C. appella at the time of our survey.
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Struhsaker et al. (1977) studied this question.
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