Page last updated at 13:52 GMT, Monday, 22 February 2010

Secret elephant language announces birth

There is more to the way elephants communicate than the well-known trumpet call.

The creatures also use a low-frequency 'rumble' - like a growl - which includes a component that is not audible to the human ear.

The BBC's Pallab Ghosh has been speaking to Matt Anderson about San Diego Zoo's findings.


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