Add Yahoo as a preferred source to see more of our stories on Google. Sixty years ago, scientists embarked on an experiment to teach American Sign Language to chimpanzees—and ultimately prove humans ...

Add as a favourite source on Google Add DutchNews as a favourite source on Google Chimpanzees in the wild use gestures that are not common to the group, showing they can develop their own sign ...

Thank you for signing up! Did you know with a Plus subscription to Express and Star you get full access to our award winning journalism for the news that matters to you and more. Chimpanzee sign ...

Loading external pages may require significantly more data usage than loading CBC Lite story pages. Two chimpanzees who made history for learning to communicate using American Sign Language are ...