Slovenia, Postojna, April 13, 2007
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The olm, or proteus (Proteus anguinus), is the only cave-dwelling chordate species found in Europe. In contrast to most amphibians, it is entirely aquatic, and it eats, sleeps, and breeds underwater. Living in caves found in Dinaric Alps, it is endemic to the waters that flow underground through extensive limestone of karst of Central and Southeastern Europe, specifically the southern Slovenia, the Soča river basin near Trieste, Italy, southwestern Croatia, and Herzegovina.