"You key there me cookie." With that sign language, Koko the gorilla tells her mentor; 28-year old graduate student Penny Patterson, to get the key,...
In several previous experiments, sign language has been taught to chimpanzees, but this is the first real attempt with a gorilla. At left, Koko...
Koko, a four and a half year old gorilla, who has been taught some sign language, made her debut her 5/19. At left Francine "Penny" Patterson,...