Robin Williams was a great and charismatic actor and human being. We are all so sad that he is gone. So is his gorilla friend, Koko. In 2001, Williams visited the Gorilla Foundation in California and became friends with Koko, who can understand words in English and use American Sign Language to communicate. They played together and tickled each other. Since she found out, Koko is mourning the loss of her friend. Watch this moving video.
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