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The fact that all our ape cousins - chimpanzees, gorillas and orangutans - can acquire signs - is powerful evidence that our hominid ancestors' first language was gestural and that the vocal version of language was a relatively recent development. My own guess is that vocal language began emerging about 200,000 years ago.

The fact that all our ape cousins - chimpanzees, gorillas and orangutans - can acquire signs - is powerful evidence that our hominid ancestors' first language was gestural and that the vocal version of language was a