It has volcanic rock complexes with caves and Thracian niches, oak woods, rare and protected species of amphibians, reptiles, birds, and mammals. Here one can watch the Spanish wheatear, the red-backed shrike, the black-headed bunting as well as the black stork and the Egyptian vulture, both included in Bulgaria’s Red Book. In the region we can find the spur-thighed tortoise and Hermann"s tortoise, both threatened with extinction on a worldwide scale.The protected site is of great significance for the preservation of bats. The caves provide shelter for three species threatened with extinction on a worldwide scale - the greater horseshoe bat, the Mediterranean horseshoe bat, and Geoffroy"s bat. The Geoffroy"s bat colony numbers some 7000 individuals and is the biggest in Bulgaria.