Koko, the gorilla who mastered sign language, died Tuesday in California at the age of 46.
While on assignment for 60 Minutes in 1978, Morley Safer met Koko, who was 6 years old at the time, and Dr. Francine "Penny" Patterson, the psychologist who taught the ape how to sign. In the story, Koko requested something to eat by using a computer that translated the keys she hit into voiced language.
An excerpt of the story is in the video player above.