Birding is thriving, especially during seasonal migrations when birds move between their summer and winter homes. Surprisingly, much of this action takes place at night, hidden from view. By using simple electronics and sophisticated software, you can easily identify nocturnal migratory birds. Flying at night helps birds avoid predators, navigate using stars, and minimize heat stress. By recording bird calls with a homemade setup, you can distinguish different species passing overhead. With this approach, even amateur bird watchers can uncover the secret world of migrating birds in the dark of night.
https://spectrum.ieee.org/detect-migrating-birds-with-sound