Many animal species are dependent on the giants. In each tree level, different animals and plants live together with the tree or use parts of it as a food source. These floors are built like a skyscraper.

This makes the root area of the trees the ideal living space for countless species of fungi, bacteria, and insects.

The trunk grows with the increasing age of a tree. It provides space for many animal species and in its bark insects and other living creatures find shelter and food. Different beetle species lay their eggs on the trunk. The larvae bore into the wood and live there until they fly out as finished beetles. These holes, in turn, accept other insects or fungi. Little by little more wood peels off, is decomposed by fungi, or removed by woodpeckers. Caves develop, which offer a breeding place to birds. Also squirrels or bats raise its boys in trees or use the caves as winter-quarters.

The treetop is the place where most of life is visible to us. Birds build their nests here and raise their young, squirrels jump from branch to branch to escape predators. From time to time, a raccoon can also be disturbed during tree care work. Begun of tree snakes over primates up to sloths everything is represented. Also, the small little animals are not to be neglected. Caterpillars feed on the leaves of the trees until they pupate. Fungi, bacteria, and insects multiply on the leaves or branches, which is not always pleasant for the tree.

The tree also indirectly offers shelter to many living creatures. Badgers and foxes use the root plates of fallen trees for their construction or dig directly under a standing specimen. The roots give the earth hold and protect the cave from collapsing. Also, roe deer and red deer depend on trees. They hide in the young thicket and only come out on open meadows at feeding times.