Cast
A documentary that follows Dr. Penny Patterson's current scientific study of Koko, a gorilla who communicates through American Sign Language.
Koko (Acting)
9 April 2019
31 October 2014
17 December 2004
6 August 2004
7 October 2008
19 June 1997
8 March 1996
22 March 2007
1 July 1987
10 April 1957
18 July 2001
7 April 1993
14 June 1995
26 July 2002
26 November 2010
17 November 2000
25 November 1992
15 September 1999
30 April 2002
27 May 1994
11 October 1978