Question

How do bats fly safely in the dark?

Answer 1

Echo location

They send waves that get reflected from objects around them and reach their ears. They dicepher the reflected waves and hence find the position of obstacle/prey. And hence bats are nocturnal animals

Answer 2

They produce ultrasonic sound quaks that gets bounced by object around and gets back to bats. By observing the intensity of it, they know the exact location of object and find way to go.