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African elephant (Loxodonta africana)
Stand near an elephant herd, and you may feel a strange vibration in your chest. That’s not your heart beating in terror because you’re, well, standing next to an elephant herd. Or at least that’s not all it is. It’s also a sign that the elephants are talking to one another.
Elephants are famous for their trumpeting, of course, but they also produce rumbles pitched so low that humans can’t hear them, only feel them as a sort of physical buzzing.
From Discover Magazine
Recent discoveries have shown that elephants can communicate over long distances by producing a sub-sonic rumble that can travel over the ground faster than sound through air. Other elephants receive the messages through the sensitive skin on their feet and trunks. It is believed that this is how potential mates and social groups communicate.