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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, graduate student at Stanford and main instructor of Koko, asks the gorilla if she is hungry and Koko is answering back that she is. In center is June Monroe, an interpreter for the deaf at St. Luke's Church, who helped teach Koko. The famed gorilla Koko, known for mastering sign language and building a rapport with humans, has died in California, a research center announced Thursday, June 21, 2018. She was 46. (Photo by Bettmann Archive/Getty Images)
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