'' Koko : A Talking Gorilla '' ( ) is a 1978 documentary directed by Barbet Schroeder that focuses on Francine Patterson and her work with Koko , the gorilla Patterson claims to have taught to communicate with humans using symbols taken from American Sign Language . The film was screened in the Un Certain Regard section at the 1978 Cannes Film Festival
1978 Cannes Film Festival
1978 Cannes Film Festival
Koko: A Talking Gorilla