Gorillas are born with an international sign language of gestures that they use to communicate. The largest scientific study of the great apes revealed they had a repertoire of 102 different signals - ...

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This spawned a whole area of new research based on teaching sign language, specifically Ameslan, the American version of signing. This was a turning point in our understanding of apes. Chimpanzees ...

The similarities between apes and people have long fascinated scientists. Yet, writes Mary Colwell, the differences can be just as thrilling. "When you look into the eyes of an ape you see an ...