KOKO: THE GORILLA WHO TALKS TO PEOPLE (BBC1, Wednesday, 8.30pm) KOKO the female Western Lowland gorilla is the subject of this fasinating documentary.
Graduate Penny Patterson first met Koko in San Francisco Zoo in 1971 and started teaching her sign language. But what started as a scientific experiment evolved into a unique relationship which has challenged the way we think about animals.
Koko has mastered hundreds of signs over the years and her unique life has been filmed every step of the way by Dr Ron Cohn, who has shot more than 2,000 hours of footage charting the life of Koko and Penny.
Now aged 70, Penny's life still revolves around caring for the 300-pound gorilla and this documentary explores what we can learn from this extraordinary science experiment-turned-unique friendship and asks the question: can animals actually communicate with humans and even share their thoughts and feelings with us? | Koko and Penny
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