Elephants communicate in all sorts of wonderful ways. They trumpet, of course, and flap their ears and rumble at frequencies so low you might feel it, but never hear it. Cooler still, their feet and trunks are sensitive enough to pick up vibrations created by elephants as far as 10 miles away. These messages convey more than the presence of food or danger, too. Elephants can tell if the stomper is a friend or a stranger, and use subtle differences in what each foot feels to triangulate the source—like how you know where someone’s yelling from just by hearing them.