Koko - The Gorilla Who Talks

Aired: 8/1/2016 | 0:54:51 | Expires: 1/1/2024 | Episode
In 1971 Penny Patterson began teaching sign language to a gorilla named Koko, unaware that this relationship would define both their lives. Over 40 years on, now internationally famous, Koko continues to redraw the line between people and animals.