Decaying trees, either laying or standing tree stumps, show the biodiversity of forest. They offer habitats for fungi, mosses, lichens, insects, arthropods and many organisms that are invisible to the human eye. The closer you look, the more you can see. There are exciting worlds insde the stumps. Such stumps are needed in every forest, but less and less can be seen. The portrayed stumps were found in Järvselja primeval forest and Karula National Park.