A documentary that follows Dr. Penny Patterson's current scientific study of Koko, a gorilla who communicates through American Sign Language.
Release Date: October 11, 1978
April 23, 2003
January 20, 2023
June 15, 2016
April 13, 2013
January 01, 1951
September 01, 2007
March 08, 2019
May 23, 2019
January 01, 2007
November 07, 2014
January 01, 1996
January 01, 2008
November 21, 1958
January 07, 2024
September 05, 2019
March 04, 2023
March 25, 1992
November 07, 2016
April 11, 1956
January 28, 2017
