Olm

The olm, or proteus (Proteus anguinus), is a blind amphibian endemic to the subterranean waters of caves of the Dinaric karst of Central and Southeastern Europe. It lives in the waters that flow underground through this extensive limestone region, including waters of the Soča river basin near Trieste, Italy, through to southern Slovenia, southwestern Croatia, and Herzegovina. The olm is the only species in the Proteus genus, the only European species of the Proteidae family, and the only cave-dwelling chordate found only in Europe. It is also occasionally called the "human fish" by locals because of its skin color, similar to that of white people (translated literally from Slovene: človeška ribica and Croatian: čovječja ribica), as well as "cave salamander" or "white salamander." In Slovenia, it is also known by the name močeril, which translates as "the one that burrows into wetness."