Koko Koko

Koko, the gorilla who became an ambassador to the human world through her ability to communicate, has died. She's seen here at age 4, telling psychologist Francine "Penny" Patterson (left) that she is hungry. In the center is June Monroe, an interpreter for the deaf at St. Luke's Church, who helped teach Koko. Bettmann Archive/Getty Images hide caption

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Bettmann Archive/Getty Images

Koko, seen here with Penny Patterson (left) at age 4 1/2 — nearly 40 years ago — was taught sign language. June Monroe, an interpreter for the deaf at St. Luke's Church who helped teach Koko, is in the center. Bettmann Archive/Getty Images hide caption

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Bettmann Archive/Getty Images