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In 1971 Penny Patterson began teaching sign language to a gorilla named Koko, unaware that this relationship would define both their lives. Over 40 years on, now internationally famous, Koko continues to redraw the line between people and animals.

 
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In 1971, Penny Patterson began teaching sign language to a gorilla named Koko, unaware that this relationship would define both their lives. More than 40 years later, the now-famous Koko continues to redraw the line between people and animals.
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