Question
How can bats ascertain distances, directions, nature and size of the obstacles without eyes?
Solution
Ultrasonic waves are produced and received by bats during it's flight. After being reflected by the obstacle in it's path, the bast receives these waves. From the time interval between transmission and reception of ultrasonic waves, the bat gets information about the distance, nature of obstacle and its direction of location. Hence bats can move about freely even in total darkness.
