The Shelter Tree
Trees support the lives of many large organisms. Trees are used for food, shelter, and sites for reproduction. Many animals also use trees for resting, nesting and for places from which to hunt or capture prey.
The major characteristics of a tree that benefits wildlife is size. A good tree for wildlife must be a big tree. Small, decaying trees may support wildlife, but only small animals for a short time. The large healthy tree that has a few wounds, and a few cavities will have long term benefits for many small and large organisms. Some large animals can only use large trees for shelter.
As forests are cut repeatedly, the number of large, old, healthy trees decreases. The best way to force an organism into extinction is not to attack the organism but to attack its niche; the place where it lives and reproduces. To try to protect an organism on one side, and to destroy its niche on the other side is a folly we see done worldwide. This is why so many animals are becoming extinct, or have entered the list of endangered species.