It isn’t true that bats are “blind as a bat.”Most fruit eating bats feed by day and can see very well.Some even see colors.Even microbats,which sleep by day and hunt by night,have some vision.They use it to find food.They also use smell and,especially,hearing.
Bats send out short pulses of sound.The sounds are usually too high for people to hear.The sound waves spread out in front of the bat.They strike objects in its path and bounce back as an echo.This process,called echolocation,helps the bat find food and avoid bumping into things.
Vampire Bats