

11/10/1978
A documentary that follows Dr. Penny Patterson's current scientific study of Koko, a gorilla who communicates through American Sign Language.

Penny Patterson
as Herself

Koko
as Herself

Saul Kitchener
as Himself - Director Emeritus, San Francisco Zoo

Carl Pribram
as Himself - Professor of Neuroscience

Roger Fouts
as Himself
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