Elephants talk in rumbles too low for humans to hear, across miles of savanna
Much of elephant vocal communication happens below 20 hertz, the lower edge of human hearing, in infrasonic rumbles that can travel several miles through the ground and air. Researchers including Katy Payne first confirmed these calls in the 1980s, and elephants appear to use them to coordinate movement and stay in contact with family members far out of sight.