Koko, a western lowland gorilla who caught the public’s attention in the 1970s for her ability to use a form of American Sign Language, died in her sleep Tuesday morning (June 19), the Gorilla ...

From a sign-language-speaking gorilla to a dog who adopted dozens ... of herself for a 1978 National Geographic cover, Koko ...

Documentary telling the extraordinary story of Koko, the only 'talking' gorilla in the world ... the image of Koko mourning the death of her kitten.