Echolocation is a skill used by several animals for hunting and navigating. Bats, whales, dolphins and some birds send out sounds and listen back to the echoes these noises make as they strike nearby objects.
Daniel Kish is an expert in the use of human echolocation. Kish has been blind since he was 13 months old, but he has been able to lead a wonderfully active life and enjoys hobbies such as hiking and mountain-biking. To help him navigate, Kish uses tongue-clicks and listens to their echoes to help him create an image in his mind of the physical world around him. He calls his technique FlashSonar.
As the president of the non-profit organization World Access for the Blind, Kish has traveled the globe to teach his sonar technique and other independence skills to blind students, and even toddlers.