R.I.P. Koko, the amazing gorilla who used sign language to communicate with humans

That time Robin Williams hung out with Koko in 2001. Sad news out of Woodside, California:

Koko, the western lowland gorilla who mastered American Sign Language, passed away Wednesday in her sleep at the age of 46.

The Gorilla Foundation, an organization founded by Koko's beloved caretaker and teacher Dr. Penny Patterson and Dr. Ronald Cohn, released a statement:

...Koko touched the lives of millions as an ambassador for all gorillas and an icon for interspecies communication and...

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