Even though the water lacks nutrients, the cave is rich with troglobites, specialised cave dwellers. The 60 troglobite species living in Križna Cave rank it among the world’s most biodiverse caves.
Two animal species are named after Križna Cave (bug križnojamski brezokec, križnojamska belgrandiela). In addition, the cave hosts six species of freshwater snails, of which three are native species belonging to Belgrandiella genus. The eternal darkness of the Križna jama is also home to the narrow-necked blind cave beetle, the first described cave beetle in the world, white titanic bug, cave spider and sideswimmer Nyphargus stygius.
The entrance to the cave also serves as shelter to other animals, among them are tissue moths and cave crickets, whereas horseshoe bats rest a bit deeper.
| Number of troglobite species: | 60 |
| Number of endemics: | 3 |
| Number of species described in the Križna cave: | 2 |