Old trees and biotope trees are a valuable habitat:
- as hollow trees for woodpeckers and other "tenants"
(e.g. the collared flycatcher, Bechstein's bat
- as hollow trees for many types of large birds (e.g. the honex buzzard)
- as a habitat for insects which inhabit dead wood (e.g. stag beetles)Approximately 200 trees were therefore marked across the entire project area and taken out of commercial forestry use. These trees already have either a high value as a biotope (hollows, holes, dead wood in the crown or injuries caused by cattle) or they can still achieve this status as "target trees" as they are no longer for commercial use and therefore remain in place until they fall due to natural causes and become dead wood.