Koko, a gorilla said to have mastered American Sign Language, died in the US state of California at the age of 46 on June 19, 2018. Born at the San Francisco Zoo in 1971, Koko was said to have an IQ of between 75 and 95. The average IQ for humans is 100. | CGTN

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KOKO & PENNY READ "KOKO'S KITTEN" — PART 1: THE BOOK In this video from KokoArc, it’s 1988 and Koko is very eager to look at the book “Koko’s Kitten." This book was first released in 1985 by Scholastic. Koko looks at some of the photos with Penny and signs about them. She then takes the book to higher ground to examine it on her own — an expression of her autonomy. She also demonstrates her creativity and enthusiasm by using some signs simultaneously — like “Gorilla-Animal” and “Book-Hurry." Kok

#RIPKoko : Koko the gorilla loved kittens. She helped raise them to become healthy cats, and every time she adopted a new kitten, she showed the same enthusiasm. Koko died in the Santa Cruz Mountains this week at the age of 46. READ: http://www.ksbw.com/article/koko-the-gorilla-who-knew-sign-language-dies-in-santa-cruz-mountains/21753348 ( Video courtesy The Gorilla Foundation / www.koko.org/KokoFlix-VideoBlog ) | KSBW TV Action News 8