And it's sound is driving quite a few Leesiders around the bend, a very high-pitched, whining, like an old WWII air-raid siren. It winds up very quickly, goes for about 20 minutes and then stops ...

A bat sends out very high pitched sound waves from its mouth or nose, and when the sound waves hit an object they bounce back to the bat’s ears. This enables a bat to build up a really detailed ...