Elephants make deep, rumbling calls that are too low for humans to hear, called infrasound. These rumbles travel a long way - not just through the air, but through the ground as vibrations.
Other elephants can detect those vibrations through the sensitive skin and bones of their feet and trunks, and then work out the message and even the direction it came from.
This lets elephant herds stay in touch across several miles, and may help them sense distant thunderstorms - and the rain that follows.
