Koko, the gorilla who mastered sign language and showed the world what great apes can do, has died.
원문출처 : https://www.cnn.com/2018/06/21/health/koko-gorilla-death-trnd/index.html
원문출처 : https://www.cnn.com/2018/06/21/health/koko-gorilla-death-trnd/index.html