The Tauglgries European Nature Reserve is made up of more than just the gravel plains formed directly by the water in the bed of the Taugl. The riverbed is flanked on both sides by former alluvial forests. Although the latter have since become detached from the water regime of the Taugl thanks to the downcutting of the riverbed, they are still valuable habitats.

We find natural ravine and hillside forest and a fantastic beech forest. Along with beech, sycamore maple and ash grow on the steep banks. Along with other wildflowers, orchids such as the strictly protected lady's slipper find a place to bloom in the species-rich undergrowth. There are stands of thermophilic, dry winter heath-pine forest on the dried-out high terraces.

Dead wood revitalizes the forest, as odd as that may sound. Horntails, ichneumonid wasps, bark beetles, gorgeous longhorn beetles, and cavity-dwelling birds and bats all depend upon dying trees for their existence. Numerous fungus species aid in the decomposition of dead wood.