Birds

Oilbirds and swiftlets are birds that use echolocation to find their way in the dark. They live in caves where there is no light. These birds make clicking sounds with their mouths, and the sounds bounce off walls and objects. The echoes help them know where things are so they don't crash into them. Their echolocation is not as strong as bats' or dolphins', but it works well in small, dark spaces. Oilbirds use this skill to find their nests and move around while looking for food. Swiftlets, which live in Asia and other places, also use echolocation to fly safely inside caves. Their clicks are loud enough for people to hear.