The Grumsin is unaffected Buchenwald for more than 20 years.
A special feature of the forest are the many valleys that are often filled with water. Granite boulders are found in rural areas, as a legacy of the Ice Age. The Grumsin represents the base-rich lowland beech forest in the region.
Within the nature reserve “Poratzer moraine Görlsdorfer bunch” of Grumsin with other large forested areas, there are several important breeding grounds. Eagles, cranes, black woodpecker and the black stork can be seen here. Specific types of area are among others the dove, green woodpecker, middle spotted woodpecker, lesser spotted woodpecker and the Marsh Tit.