of critical evaluations of her reports of signing behavior in great apes argued that video. 1978 Koko: A Talking Gorilla, a documentary film by Barbet Schroeder 1978 Cover of National Geographic magazine that Koko shot, as well as feature article 1980 Congo, a novel by Michael Crichton inspired by Koko's story 1981 The Education of Koko, a book by Patterson. When her trainer asked the meaning of the name, Koko answered, Lips lipstick. 19 Koko's weight of 280 pounds (127 kg) was higher than would be normal for a gorilla in the wild, where the average weight is approximately 150200 pounds (7090 kg but the foundation stated that Koko "is, like her mother, a larger frame Gorilla". Retrieved July 15, 2018. 30 Use of language edit Patterson reported that Koko's use of signs indicate that she mastered the use of sign language.