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3:05
In this clip we see how Penny began to work with Koko.
3:15
Penny moved Koko from San Francisco Zoo to Stanford, where their communication work began.
2:24
Although Penny and Koko were now deeply bonded, Koko still belonged to San Francisco Zoo.
3:20
Another ape language specialist became convinced that the whole field was flawed.
3:02
Koko adopted a kitten called All Ball.