The Olm or Proteus (proteus anguinus) is an aquatic salamander.
Cave biologists have announced that one of the world’s most mysterious cave-dwelling creatures has laid an egg, completing a cycle that takes 6 years. The Olm or Proteus (proteus anguinus) is an aquatic salamander and is Europe’s only cave adapted vertebrate, with individual females reproducing only once every six to seven years. It hunts prey in absolute darkness and, most unusually of all, the creature can survive without food for up to ten years and can live up to 100 years. Postojna Cave in Slovenia has been working to preserve the species.