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, 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 celebrated western lowland gorilla, died at the age of 46 this week. Many people paid tributes to her by praising her signing skills. She's famous for her signing skills, but all is not what ...

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 ...