Bats are a fascinating group of animals. They are one of the few mammals that can use sound to navigate–a trick called echolocation. Of the some 900 species of bats, more than half rely on echolocation to detect obstacles in flight, find their way into roosts and forage for food. Find out in this article by Scientific American.
https://www.scientificamerican.com/article/how-do-bats-echolocate-an/