What sound does a bat need to hear to survive or protect itself?

Bats rely on echolocation to navigate and hunt for food, so they need to hear high-frequency sounds reflected off objects in their environment. Specifically, they emit ultrasonic calls and listen for the echoes that return, allowing them to detect obstacles, locate prey, and avoid predators. Additionally, hearing sounds associated with potential threats, such as the rustling of leaves or movements of larger animals, is crucial for their survival and protection.