Echolocation is a way of sensing the world by making sounds and listening to how they bounce back. Bats are famous for using echolocation to hunt insects in complete darkness. A bat sends out high-pitched squeaks, then listens for the echoes that return when those sounds hit a flying mosquito, a tree branch, or a cave wall. From these echoes, the bat creates a kind of sound map of everything around it, telling it where objects are, how far away they are, how big they are, and even whether they're moving.

Dolphins and whales use echolocation underwater, sending out clicking sounds to navigate murky ocean waters and find fish. Some blind people have learned to use echolocation too, making clicking sounds with their tongues and listening carefully to the echoes to sense walls, doorways, and obstacles.

What makes echolocation remarkable is how much information it provides. A bat can tell the difference between a moth and a beetle in mid-flight just from how the echo sounds. For animals that use it, echolocation can work better than vision in darkness or cloudy water, turning sound into a detailed picture of the world.