Extras
In this clip we see how Penny began to work with Koko.
Penny moved Koko from San Francisco Zoo to Stanford, where their communication work began.
Although Penny and Koko were now deeply bonded, Koko still belonged to San Francisco Zoo.
The unique story of a life-long relationship between a scientist and Koko the gorilla.
Another ape language specialist became convinced that the whole field was flawed.
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The unique story of a life-long relationship between a scientist and Koko the gorilla.