A leaflet "Hidden life inside Velebit" is published by the Public Institution of Velebit Nature Park and Croatian Biospeleological society. A leaflet briefly explains richness and importance of subterranean fauna. On Velebit there are 16 caves from which 23 species of cave animals were described. Almost all described species are endemic to Velebit Mt. It also points to the sensitivity and vulnerability of caves and cave fauna. Wild landfills and sewage discharge into the underground are the main factors that negatively affect the habitats and life in the caves of Velebit.