In the caves of Slovenia and Croatia lives an animal that’s a cross between Peter Pan and Gollum. It’s the olm, a blind, cave-dwelling salamander, also called the proteus and the “human fish ...

Proteus anguinus (called the olm or the proteus) is a slender, foot-long aquatic salamander native to southern Europe. The earliest written accounts of the animal, by a 17th-century Slovenian ...