Koko, the western lowland gorilla that began to learn sign language in the San Francisco Zoo and eventually became a celebrity beloved by millions, passed away in her sleep Tuesday at the age of 46.

Koko, the gorilla who mastered sign language, has died. The Gorilla Foundation says the 46-year-old western lowland gorilla died in its sleep at the foundation’s preserve in California’s Sana Cruz ...

Koko the gorilla, whose remarkable sign-language ability and motherly attachment to pet cats helped change the world’s views about the intelligence of animals and their capacity for empathy, has died ...

Koko, a beloved gorilla that learned to communicate with humans and then stole their hearts, has died. The Gorilla Foundation said the 46-year-old celebrity ape - a western lowland gorilla - died in ...

Koko the gorilla is famous for having learned a number of hand signs to help her communicate with her caregivers. So when she was introduced to a box full of kittens she told her trainers, in the only ...

Koko appeared in many documentaries and twice in National Geographic. Her 1978 cover featured a photo she had taken of herself in a mirror You can save this article by registering for free here. Or ...

Koko the gorilla wasn’t just an experiment - she was a conversation. Using American Sign Language, she could express over 1,000 words, understand 2,000 spoken words, and communicate thoughts, feelings ...

WOODSIDE, Calif. -- Koko, the gorilla who mastered sign language, has died. The Gorilla Foundation says the 46-year-old western lowland gorilla died in her sleep at the foundation's preserve in ...

SAN FRANCISCO—Koko the gorilla, whose remarkable sign-language ability and motherly attachment to pet cats helped change the world’s views about the intelligence of animals and their capacity for ...

The Gorilla Foundation says the 46-year-old western lowland gorilla died in her sleep at the foundation’s preserve in California’s Santa Cruz mountains on Tuesday.