Bonobo mothers shake their heads to say NO when their infants play with their food.
Bonobos have been filmed appearing to 'say no' by shaking their heads, report scientists.
On a number of occasions, bonobos were filmed using side to side head movements to prevent others from doing something they did not want them to do.
This may reflect an early precursor to head-shaking behaviour amongst humans in one of our closest relatives.
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