The tree frog(Hyla arborea) is an excellent climber. It climbs trees with its adhesive discs on the tips of its fingers and toes. But you have to look closely to spot this little "tree frog". In the green thicket it is difficult to recognize with its light green body color. Only a dark stripe runs along the sides of his body from his nostril to his hip.

During the breeding season from April to July, the male sings in chorus with other tree frogs in pools, ponds and ditches. A tree frog concert can last from dusk until deep into the night on warm evenings.

This amphibian species is highly endangered in Austria and threatened with extinction in Tyrol. The largest population in Tyrol is found in the Tyrolean Lech Valley. Tree frogs like it warm. That is why they only colonize the lower, lower sections of the Lech between Reutte and Vils.