The olm is a unique aquatic salamander native to the underground rivers and caves of Slovenia, Croatia, and Italy. It is known for its pale, almost translucent skin and its ability to live in complete darkness. The olm can grow up to 30 centimeters long and has a lifespan of over 50 years. This fascinating creature is adapted to its dark environment, possessing well-developed senses of smell and hearing, while its eyesight is reduced. The olm primarily feeds on small invertebrates, such as crustaceans and insects, and is an important part of the cave ecosystem.