Cave animals – what can we learn from life hidden underground?

When we think about nature, we rarely think about the world that lies beneath the earth's surface.
But it is precisely there – in the darkness of caves, crevices, and underground tunnels – that an extremely sensitive and diverse ecosystem exists, one that has a surprisingly large impact on our lives.

At the heart of this hidden world are the Leptodirini – a tribe of cave beetles that, through long evolution, have completely adapted to life without light. Without eyes, without pigment, with highly developed antennae and a slow way of life, they represent one of the most fascinating examples of organisms adapting to extreme conditions.

In the video, Assoc. Prof. Teo Delić, a researcher of underground animals at the Biotechnical Faculty of the University of Ljubljana and co-author of the book Živo podzemlje Slovenije (The Living Underground of Slovenia), talks about this world that most people never see. His research not only reveals unusual creatures from the darkness, but also raises important questions about the connection between humans and nature.

His research not only reveals unusual creatures from the darkness, but also raises important questions about the connection between humans and nature.
Why should those who live far from caves also be interested in cave animals? Because underground ecosystems are not separate from our everyday lives. Cave animals are closely linked to the quality of the groundwater from which we draw our drinking water and are extremely sensitive indicators of changes in the environment. Pollution, human intervention, and climate change often manifest themselves underground before they do on the surface.

In the interview, Dr. Delić explains why leptodirans are so important for scientific understanding of nature, how research is conducted in complete darkness, and what challenges researchers face when observing animals that live far from human sight. He also talks about surprising discoveries and personal moments in the field—about caves and animals that have remained in his memory forever.

He also places special emphasis on the issue of conservation: what cave animals teach us about balance in nature, why it is important to talk to children and young people about the underground world, and how each individual can contribute to the preservation of these fragile ecosystems – even without visiting a cave.

This video is not just a scientific discussion. It is an invitation to reflect on a world that we cannot see, but which is crucial to our survival. If you are interested in how deep the connections between humans, water, and underground life are, we invite you to watch.