Right now, somewhere on the African savanna, an elephant is having a conversation you will never hear. Her rumble drops below 20 Hz — below the floor of human hearing — and rolls outward across six miles of open grassland to reach her sister’s herd. The reply comes back minutes later, equally invisible to us, and the two families begin moving toward each other. We stand among them seeing nothing, hearing nothing, missing almost everything. Elephants communicate in a world that largely exists beneath our senses, and the more scientists look, the richer that world turns out to be.
Key fact: Elephants communicate through at least four distinct channels — vocalizations, infrasound, body language, and seismic vibrations felt through the ground. Some of their calls travel over 6 miles and can only be heard by other elephants.