Several language experiments with chimpanzees, orangutans, gorillas, and bonobos have shown that all great apes have the capacity to use signs and symbols to communicate. Questions, however, have been raised about this type of research.

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Several language experiments with great apes have indeed shown that they have the capacity to use signs and symbols to communicate, but there have also been ethical concerns and debates about the validity and limitations of this research.

Several Language Experiments with Chimpanzees, Orangutans, Gorillas, and Bonobos Have