Koko, the western lowland gorilla who learned sign language, died on Thursday. Koko, the western lowland gorilla who learned sign language and became a pop-culture phenomenon, has died at the age of ...

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.

Koko, the sign language-speaking gorilla, died unexpectedly in her sleep last week, just shy of what would have been her 47th birthday on July 4. News of her death saddened millions around the world, ...