One clear example of food effects on primate behavior is the contrast between folivores and frugivores.
Folivorous, or leaf-eating, primates, generally have small home ranges that overlap with those of neighboring groups. When two groups encounter, they often avoid each other or leave without any obvious reaction.
By contrast, frugivorous, or fruit-eating, primates, often have large home ranges, and the overlap of the ranges is generally small, since neighboring groups compete for limited fruit resources.
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