“Bats are blind.”

The enduring phrase "blind as a bat" has led many to believe that these nocturnal flyers are sightless, relying solely on sound to navigate the night. This misconception has roots stretching back centuries, possibly even to Aristotle, when the mysterious, erratic flight of bats and their small eyes in comparison to their prominent ears led people to assume an absence of vision. Coupled with their nocturnal habits, it was easy to conclude that if they could see, they wouldn't need such an extraordinary "sonar" system.

However, scientific evidence paints a very different picture. Bats are far from blind; many species possess vision that is often as good as, or even superior to, human eyesight, particularly in low-light conditions. Their eyes are specially adapted to the dim environments in which they hunt, requiring less light to see clearly than humans do. Some bats, like certain fruit bats, have exceptionally sharp vision, and some species can even detect ultraviolet light, which is invisible to the human eye, aiding them in tasks like locating UV-reflecting flowers.

The widespread belief that bats are blind largely stems from a misunderstanding of echolocation. While it is true that many bats use this remarkable ability—emitting high-frequency sounds and interpreting the echoes to create a detailed "sound map" of their surroundings—this skill complements their vision rather than replacing it. Bats use echolocation for precise tasks like hunting insects in complete darkness, but they also rely on their eyesight for long-distance navigation, detecting large obstacles, and discerning the cycle of day and night. Their integrated sensory system allows them to thrive in various environments, using the best sense for the specific situation.