Koko - The Gorilla Who Talks

Facing Critics

Clip | 3m 20s

Although Penny was sure that Koko was communicating with her, another ape language specialist, Herb Terrace, became convinced that the whole field was flawed, and published a study to suggest that apes did not know what they were saying, a blow to Penny and other scientists working in the field.

Aired: 08/02/16

Rating: TV-G

Video has closed captioning.

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