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 ...

In 2004, Koko used American Sign Language to communicate that her mouth hurt and used a pain scale of 1 to 10 to show how badly it hurt. “Koko represents what language may have been 5 million ...

Koko was born at the San Francisco Zoo, and Dr. Francine Patterson began teaching the gorilla sign language that became part of a Stanford University project in 1974.

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 is famous for having learned a number of hand signs to help her communicate with her caregivers. In the adorable video recently released by The Gorilla Foundation in Redwood City, ...

Koko, famous gorilla who mastered sign language, dies at 46 By Staff The Associated Press Posted June 21, 2018 8:00 am Updated June 21, 2018 7:28 pm ...

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 ...