Twenty-one students in the age of 15 and 16 years, attending Stredná odborná škola hotelových služieb a obchodu in the city of Zvolen, and 2 teachers accepted invitation of workers of the Institute of Forest Ecology SAS to a field-trip to the Mláčik National Nature Reserve in the Kremnické vrchy hills on 16th of October. Margita. Kuklová, Ján Kukla, Martin Kubov and Katarína Sládeková from the Institute of Forest Ecology of the Slovak Academy of Sciences lectured students during the trip and explained why the highest level of protection is valid in the territory of the Mláčik NNR. The national nature reserve was established in 1982 to protect well-preserved plant and animal communities of the fir-beech forest vegetation tier and forest wetlands with earl and another phytocoenologically important species. The most students have never visited these places before. They all managed to complete the trip despite the fact, that some of them were not used to walk such a long distance. And they had also to move over fallen trees. A beautiful weather of Indian summer contributed to the success of the undertaking. Its aim was to bring closer to young people the precious protected natural values occurring in the near region. The field-trip was held with support of the Slovak Society for Agricultural, Forestry, Food and Veterinary Sciences to the Slovak Academy of Sciences in Bratislava.