Viki.

About Viki

Viki was the subject of one of the first experiments in ape language, dating back to the late 1940s and early 1950s. Viki the chimpanzee was raised by Keith and Catherine Hayes in the same manner as a human infant, to see if she could learn human words. She was given speech therapy, which involved the Hayeses manipulating her lower jaw. Eventually, she was able to voice four words:mama