A cerulean warbler calls out to her mate in a lush forest. If no one is around to hear it, does the warbler make a sound? 🐦🔊 Thanks to bioacoustics research conducted by the University of Wisconsin-Madison in Wisconsin's Baraboo Hills, the warbler’s metallic, buzzy "zeet" is being captured—along with other bird song, insect buzzes, frog calls and more—revealing the complex, rich soundtrack of the oak woodland that reveals crucial insights about biodiversity and the work TNC does to manage the