Portal:Amphibians and reptiles/Selected article/2

The Olm or Proteus (Proteus anguinus) is an amphibian living in subterranean waters of the Dinaric karst from the Soča river basin near Trieste in Italy through southern Slovenia and southwestern Croatia to Herzegovina. It is the only species in the genus Proteus, the only European species of the family Proteidae, and the only European cave-dwelling chordate. It is also called the "humanfish" (translated literally from Slovenian: Človeška ribica and Croatian: Čovječja ribica), Cave Salamander, or White Salamander.

This animal is most notable for its adaptations to life in the complete darkness of its underground habitat. Its eyes have atrophied, leaving the Olm blind, while its other senses, particularly those of smell and hearing, have become sharper to compensate. It also has no skin pigmentation. In contrast to other amphibians, the Olm is wholly aquatic, not only breeding but living its entire life underwater. This is possible due to larval characteristics, such as external gills, which they retain as adults.