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US scientists have discovered that elephants call to each other using their names. While dolphins and parrots are known to address each other by mimicking sounds -- elephants are the first non-human species found to create names for each other, which they express as a series of rumbles. George Wittemeyer is the chairman of Save the Elephants’ Scientific Board, a professor at Colorado State University, and a co-author of the new research. He spoke to Newshour's Tim Franks from Samburu, in central Kenya.