Koko : the gorilla who talks
- DVD 599.884 K7985 (CEN, OSH, WSQ)
In English, with optional English subtitles.
Narrated by Demetri Goritsas.
[Arlington, VA] : PBS Distribution, 
Title from container.
Originally broadcast on PBS in 2016.
In 1971, graduate student Penny Patterson began teaching sign language to a gorilla named Koko. What started out as a scientific experiment evolved into an intimate friendship, which for almost half a century has challenged the way we think about animals and changed the course of many lives. It is a unique window into this incredible relationship.