American Bittern Sounds, All About Birds, Cornell Lab of Ornithology

Turn up the volume and watch closely to hear—and see—one of the North American bird world's more unusual calls. “I recorded this the other day while watching two American Bitterns call to each other!" writes Kasey Macsenti from Oregon. "Such a lovely exchange!” What's going on? “To communicate with each other through dense vegetation American Bitterns use low-frequency calls, which carry farther than higher-pitched sounds," writes the Cornell Lab of Ornithology. "During breeding season the males