Elephants can make noises as loud as 103 decibels. That’s like hearing a jet fly overhead at 1000 feet!

Communication is important to these very social animals; it allows them to pass down information to younger generations and form strong bonds with one another. Since elephants don’t have the greatest vision they rely heavily on their other senses, like hearing. When elephants communicate they often use low frequency sounds, called infrasound, some of which is passed through the ground. Elephants are great at remembering calls and figuring out who’s doing the talking. These massive mammals can pick out when a sound is being made by a family member, some older females can even recognize the calls made by of over 100 different elephants!

http://www.ias.ac.in/currsci/oct102005/1200.pdf

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