Amphibians are tied to water by their life cycle. They are extremely sensitive to pollution, which makes them excellent bioindicators.
Of the nine recorded species of amphibians, the fire salamander (Salamandra salamandra), a secretive animal of damp dark forests, is the most difficult to spot, while along the banks of the river one can often see the most numerous species, the marsh frog (Pelophylax ridibundus). In spring, during breeding season, one can see common toads (Bufo bufo) and European green toads (Bufo viridis) in the surrounding marshes.
In ponds along the upper course of the river, the smooth newt (Lissotriton vulgaris) lives, while throughout the entire Park in the treetops you can hear the call of the tree frog (Hyla arborea), one of the smallest European frogs, and in the waterlogged meadows, along the edges of the forests, and in the reeds by the river, you can find the agile frog (Rana dalmatina), active mainly during the day and at dusk, especially in the rain.
The value of the amphibian fauna is further increased by the Natura species, the old (the old (Proteus anguinus),(Proteus anguinus), which is endemic to the Dinarides. Populations of this stygobiont dwell in caves in the area of the Miljacka waterfall and in the cave called Jama opposite Torak. The olm is an endangered species (EN).
