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DVD, 2016
Current format, DVD, 2016, Widescreen edition., All copies in use.
DVD, 2016
Current format, DVD, 2016, Widescreen edition., All copies in use. Offered in 0 more formats
In 1971, graduate student Penny Patterson began teaching sign language to a gorilla named Koko, a scientific experiment that evolved into an intimate friendship lasting almost half a century and changed the course of human-animal communication.
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TV Parental Guidelines rating: TV-G (general audience; most parents would find this program suitable for all ages).
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