Blind as a Bat

Etymology:

• The origin of this idiom is very old and it belongs to the 15ht century. There are many idioms related to animals that define their characteristics in a typical manner. But this idiom is very different, as it tells that bats are blind and that is actually not true. Flying fox bats have a very good vision. American warfare institute is working hard to use this sonar technology that bats are equipped with to, help soldiers, see better at night.