Koko the gorilla has died at age 46 in her sleep. Koko became world famous with her ability to communicate 1,000 words of sign language and was able to understand 2,000 words of spoken English.
The late Robin Williams visited Koko many times. You can see the video of his visit below. Koko showed sadness when she was told of Robins passing.
The gorilla foundation released the following statement.
"The foundation will continue to honor Koko's legacy and advance our mission with ongoing projects including conservation efforts in Africa, the great ape sanctuary on Maui, and a sign language application featuring Koko for the benefit of both gorillas and children."