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WOODSIDE, Calif. — 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 ...

Koko, the western lowland gorilla that died in her sleep Tuesday at age 46, was renowned for her emotional depth and ability to communicate in sign language. She became an international celebrity ...

One of the first words that Koko used to describe herself was Queen. The gorilla was only a few years old when she first made the gesture—sweeping a paw diagonally across her chest as if tracing a ...

Sign language is a language you express by using your hands and face instead of spoken words. It’s most commonly used by people in the Deaf community. How many types of sign language are there? There ...