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“Tree hollow habitat” project, October 2


Elm, Glarus

Important note: Will be carried out taking protective measures into consideration



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.

Current project status

Project progress

2 spacesare still free (out of a total of 3)

4 daysremaining until (registration deadline)


  • Whole day, Saturday, October 2, from 9.00-16.00
  • Other possible dates: October 1 and 3 -> see other published projects

Elm, Glarus

How it will work:

  • Arrival of volunteers; start carving out tree cavities.
  • Work is performed on a secured platform with railings.
  • Volunteers can also be secured with ropes on the platform if they wish. 
  • Work with the hand tools (a hollowing adz) is entirely safe.
  • Those who would rather not work on the platform can work on a Klotzbeute (section of hollow tree, also called a “bee gum”) on ground level. 

Volunteers are introduced to the work at the location. No prior training required.

A project leader will support volunteers closely throughout the assignment.

Carving out of tree hollows.

What you'll need:
Love of nature; physical fitness

Photo: Ingo Arndt




09:00 - 16:00 Uhr

Project language


To registration

Our project partners

The non-profit association FREETHEBEES publicizes important aspects of the fight against bee mortality and promotes approaches to combating it, from an independent and multidisciplinary perspective. The organization's solutions are innovative. It creates incentive systems and further training in sustainable beekeeping for people interested in nature and for beekeepers; environmental education is offered to young people and children, and bee habitats are restored.