Apes' usage of symbolic codes and sign languages rises to the level of a human at the age of

Question

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Research has shown that apes such as chimpanzees and bonobos are capable of learning sign language and other symbolic codes at a level comparable to a human child around two and a half years old. The apes can not only learn to communicate with humans, but also develop a rich vocabulary and syntax. However, their ability to use complex grammar and abstract concepts still lags behind that of a human child.

Apes' Usage of Symbolic Codes and Sign Languages Rises to the Level