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What an amazing life and story!
http://www.newsweek.com/koko-gorilla-sign-language-death-988302
http://www.newsweek.com/koko-gorilla-sign-language-death-988302
Koko was born at San Francisco Zoo on July 4 1971 and was named “Hanabiko,” Japanese for “fireworks child.” Animal psychologist Francine “Penny” Patterson began teaching Koko to sign while she was a graduate student in 1972. Patterson and others eventually taught Koko to use and understand hundreds of English words. Patterson started The Gorilla Foundation in 1986 with biologist Ronald Cohn and the late Barbara F Hiller, after moving Koko to Stanford in 1974.