Watch Koko the signing gorilla in this clip from a 1981 National Geographic documentary. Koko died in her sleep on Tuesday, June 19, 2018.
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Read more in “Why Koko the Gorilla Mattered”
https://news.nationalgeographic.com/2018/06/gorillas-koko-sign-language-culture-animals/
Watch Koko the Gorilla Use Sign Language in This 1981 Film | National Geographic
https://youtu.be/FqJf1mB5PjQ
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