Plunge into the pitch-black darkness of underground caves where sunlight never reaches. In these hidden, rocky worlds, you will discover incredible creatures that have survived for thousands of years without ever seeing a single thing. Some of them do not even have eyes. You will explore how these amazing animals use sharp senses like touch, smell, and hearing to hunt for food, avoid danger, and navigate their completely dark habitats. From pale, blind cave fish swimming in silent pools to creepy crawlers scurrying along the damp stone walls, nature has found brilliant ways to adapt to life in the shadows. Learn the awesome science behind these unique physical changes and uncover the secrets of the ultimate survivors. Get ready for an exciting journey deep below the earth to meet the fascinating wildlife that thrives completely in the dark.