Animal News: Bonobos Say No by Shaking Heads Like Human?
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© 2010 National Geographic; Video Christel Schneider
Bonobos Say No by Shaking Heads Like Human?
May 20, 2010—For the first time, according to researchers, bonobos have been recorded shaking their heads to discourage other bonobos from doing something—perhaps a "primitive precursor of the human head shake."