The mammal fauna is represented by sixteen recorded families, the most numerous of which is the Vespertilionidae, from the order of bats (Chiroptera).
There are two species that occasionally appear within the boundaries of the Park: chamois (Rupicapra rupicapra) and roe deer (Capreolus capreolus).
There are a total of ten Natura target species: the otter (Lutra lutra) and nine species of bat, of which three species have the status of sensitive: the Mediterranean horseshoe bat (Rhinolophus euryale), Blasius’ horseshoe bat (Rhinolophus blasii), and Bechstein’s bat (Myotis bechsteinii), while two species have endangered status (EN): the bent-winged bat (Minopterus schreibersii) and the long-fingered bat (Myotis capaccinii). The cave Miljacka II contains the largest known colony of the latter in Europe, with around seven thousand individuals. Along with the long-fingered bats, another five species also live there.
The presence of otters has been recorded along the entire course, while the size of the population is currently unknown. Of the other mammals, two strictly protected species should be emphasized: the wolf (Canis lupus) and the wildcat (Felis silvestris), which most often live in the forest communities of downy oak and Oriental hornbeam.
