Koko, the gorilla whose apparent aptitude for sign language endeared her to fans around the world, died in her sleep on Tuesday morning, according to the Gorilla Foundation, which oversaw her care.

A gorilla using sign language to communicate affection with its caretaker.

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 who mastered sign language, raised kittens and once playfully tried on the glasses of the late actor Robin Williams, has died. She was 46. The Gorilla Foundation says the western ...