Male mice sing ultrasonic courtship songs made up of complex sequences that humans cannot hear These little performances could be happening all around us witho

Male mice sing ultrasonic courtship songs made up of complex sequences that humans cannot hear These little performances could be happening all around us without us ever noticing [▻](https://video.twimg.com/amplify_video/2099792951820070913/vid/avc1/720x960/2sgF4r7GK1-blmFD.mp4)