The IUCN Red List of Threatened Species includes three taxa and the Red List of Croatian Cave Fauna includes as many as 18 taxa.

TAXON	IUCN RED LIST CATEGORIES
DEMOSPONGIA
1. Eunapius subterraneus subterraneus	EN – endangered
2. Eunapius subterraneus mollisparspanis	VU – vulnerable
HYDROZOA
3. Velkovrhia enigmatica	CR – critically endangered
TURBELLARIA
4. Dendrocoelum subterraneum	CR – critically endangered
GASTROPODA
5. Belgrandiella pageti	VU – vulnerable
6. Hauffenia tovunica	CR – critically endangered
7. Sadleriana cavernosa	CR – critically endangered
8. Zospeum likanum	EN – endangered
POLYCHAETA
9. Marifugia cavtica	DD – data deficient
CRUSTACEA
10. Troglocaris anophthalmus intermedia	VU – vulnerable
11. Monolistra velkovrhi	EN – endangered
12. Proasellus cf. parvulus	EN – endangered
13. Niphargus jalzici	EN – endangered
14. Niphargus stygius licanus	VU – vulnerable
INSECTA
15. Duvalius langhofferi	EN – endangered
16. Croatotrechus tvrtkovici	CR – critically endangered
17. Machaerites croaticus	CR – critically endangered

The IUCN Red List of Threatened Species includes the following list of taxa:

TAXON	IUCN RED LIST CATEGORIES
CRUSTACEA
1. Troglocaris anophthalmus	VU – vulnerable
2. Calconiscellus gottscheensis	VU – vulnerable
3. Proasellus parvulus	VU – vulnerable

The subterranean fauna and bat fauna are protected by the 2005 Nature Protection Act, as well as the Ordinance on the Proclamation of Protected and Strictly Protected Wild Taxa, which prohibit their killing, disturbance and threatening in any way and any destruction of their habitats, i.e. caves and pits.

In addition to general protection of the subterranean fauna and their habitats, the Špilja u kamenolomu Tounj (Cave in Tounj Quarry) is especially protected having a category of geomorphological nature monument (preventive protection). Owing to long-term persistence of our members and repetitive warnings by state institutions, the spring areas of the Zagorska Mrežnica and Rupečica Rivers are soon to be proclaimed protected spring areas.