“Tree hollow habitat” project
Tree hollows are ecologically important; in this project, volunteers carve out cavities in trees scattered across Switzerland's natural landscape. These increasingly scarce hollows serve as refuge, breeding, wintering or feeding sites for many endangered species, including honeybees. Volunteers cut out a Zeidlerhöhle (hollows that serve as bee hives) into the trunk of a living tree.
Habitable trees with suitable microhabitats and tree hollows have become rare in the Swiss countryside. Without them, the forest ecosystem is disturbed. To strengthen the biodiversity and resilience of a forest, tree microhabitats in forest ecosystems are identified, preserved and supported when threatened.
The project's main aim is to provide nesting sites for wild honeybees and other tree-cavity-dwelling species worthy of protection. Besides honeybees, 30 types of insect, 170 different mites and arachnids, as well as thousands of microorganisms live in symbiotic community in a beehive tree hollow.