Resumo. Conflicts involving wild animals and forest plantations are registered all over the world, including the bark-stripping of native and exotic tree species by primates. In Southern Brazil, the Brown-capuchin monkey(Sapajus nigritus) is well-known for damaging commercial plantations ofPinusspp. andAraucariaangustifolia.In this paper, however, we report, for the first time in the literature the bark-stripping ofEucalyptusspp. by these monkeys. Considering the growing areas of eucalypt plantations in Brazil andneighboring countries, the information presented here is of great importance to the economy of Forestry.It also enhances the need of scientific studies aimed to minimize the damage for the production withoutjeopardizing wildlife conservation, as those designed to monitor the availability of food resources (mainlyfruits) in native forest remnants and to improve it through the restoration of degraded forests or even thosethat seek for natural deterrents.