Cave fish are unique species that have adapted to live in dark, underground environments, such as caves and subterranean rivers. These fish often lack pigmentation, resulting in a pale or transparent appearance. They have also developed enhanced sensory organs, like long whisker-like structures, to help them navigate and find food in the absence of light. One well-known example of cave fish is the Mexican tetra, which can be found in the caves of northeastern Mexico. Over time, these fish have evolved to thrive in their specific habitats, showcasing the remarkable adaptability of life in extreme conditions.