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. Koko: The Gorilla Who Talks is a unique window into this incredible relationship.
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- © 2015 BBC
- English (Stereo)
- Closed captions (CC) refer to subtitles in the available language with the addition of relevant non-dialogue information.