This part of the Zoo is relatively shadowy throughout the year thanks to the character of its terrain. This is how the trail got its name. Platform paths will take you through a relatively deep valley line. The extreme steepness of the terrain with a suspension footbridge, 27 metres long, intensifies the attractiveness of this area to a significant degree.
Full-grown beeches are dominant here. The European beech (Fagus sylvatica) grows to a height of 35–40 metres, its trunk has smooth grey bark and the crown is richly branched. In favourable conditions it lives for 350 – 400 years.
The herb layer is represented by the European bittercress (Dentaria bulbifera), the Common ivy (Hedera helix), and a woody liana with evergreen leaves.
“Sea grass” (Vignea brizoides) also grows here. It was used as padding in the past. In addition, there are numerous species of Black raspberry (Rubus).