Carl Sagan & Ann Druyan – Shadows of Forgotten Ancestors (1992)

An early Algerian myth held that long ago apes could talk, but were rendered mute for their transgressions by the gods. There are many similar stories in Africa and elsewhere. In another widespread African story, apes can talk, but prudently refuse to do so–because talking apes, their intelligence in this way made manifest, will be put to work by humans. Their silence is proof of their intelligence.

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