In 1971, graduate student Penny Patterson began teaching sign language to a gorilla named Koko. What started out as a scientific experiment evolved into an intimate friendship, which for almost half a century has challenged the way we think about animals and changed the course of many lives.
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Here’s a favorite with Koko. Robin Williams meets Koko:
https://youtu.be/Y4N1YzR7IiE?si=N9u4qXWldiIoZJHI