Proteus Vivarium

Proteus Vivarium, located just steps from the entrance to Postojna Cave, offers an intriguing look into the mysterious world beneath Slovenia’s surface. As part of the renowned Postojna Cave Park, the Vivarium is dedicated to the unique subterranean life of the karst region, with a special focus on the olm—often called the “baby dragon.” This rare, cave-dwelling amphibian is native to the area and has fascinated scientists and visitors alike for centuries.

Inside the Vivarium, visitors encounter more than 150 animal species that inhabit the underground world, from tiny crustaceans to blind beetles. The exhibition area features informative displays and live tanks, allowing guests to observe the olm and other cave creatures up close. The research laboratory section highlights ongoing scientific work, including the globally noted event in 2016 when an olm laid eggs that successfully hatched.

The Vivarium also hosts a speleobiological exhibition, which explains the geology, hydrology, and biology of karst caves, making it an educational stop for families and curious travelers. The experience complements a visit to the Postojna Cave itself, the largest show cave in Europe, and can be included in a combined ticket with other attractions like Predjama Castle.

Open year-round, Proteus Vivarium invites visitors to discover the hidden biodiversity of Slovenia’s underground and gain a deeper appreciation for the delicate balance of this remarkable ecosystem.