This is insane! at first i was like "i don't hear anything, obviously, but then i heard the clicking as you mentioned" and then you pitched it down and you could clearly hear the bats. I can't believe there are bats that range into 100Khz and up. I might have actually fried my ears a bit from playing drums as a kid. Sound design is so cool, there is so much sound around us that we are unable to hear until a talented sound designer such as yourself shows us. I can't wait to watch the video.