By Xiu Ying, Contributing Reporter

RIO DE JANEIRO, BRAZIL - The River dolphin of Brazil is something of a mystery. It was thought to be quite solitary, with little social structure that would require communication. But Laura May Collado, a biologist at the University of Vermont, and her colleagues have discovered something new.

These dolphins can actually make hundreds of different sounds to communicate, a finding that could help uncover how communication evolved in marine mammals.

“We found that they do interact socially and are making more sounds than previously thought. Their vocal repertoire is very diverse,” said study co-author . . .

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