The research on language in higher primates shows that chimpanzees are much less intelligent than we formerly thought and totally incapable of approximating human language.

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Research on language in higher primates, particularly studies involving chimpanzees, has shown that they can learn and use aspects of sign language, symbols, and other forms of communication that approximate certain elements of human language, indicating a level of cognitive abilities and intelligence that challenges earlier underestimations of their capabilities.

The Research on Language in Higher Primates Shows That Chimpanzees