Captive Cebus paraguayanus were observed to express spontaneously a wide variety of species-specific behaviors in different zoos from Argentina. The monkeys were kept in old-style wire mesh cages with cement floors, as well as island enclosures. We collected qualitative data on nine species-specific behaviors, and all the sex-age classes analyzed expressed some of these behaviors. The results indicated that in spite of living under predictable captive conditions without environmental enrichment, Cebus paraguayanus were able to react to the incidental opportunities that were presented in these environments.