ChalkyString

Wow, I'm glad to see so many other people googled to find out what was making strange nocturnal chirping sounds. I listened to audio of all the critters suggested over the past 15 years since the original post, and I finally found the source of the sound I hear each night here in Austin. And the winner is.....RIO GRANDE CHIRPING FROG!! It makes me happy knowing there are tiny frogs outside my bedroom window.