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

According to The Gorilla Foundation, Koko was a big Mister Rogers fan. She appeared on an episode of Mister Rogers Neighborhood in 1998. This video clip is from another encounter in 1999. More info: https://www.koko.org/node/1894 | PBS Hawai‘i

Mister Rogers Visits Koko... Koko was a big fan of Mister Rogers, and the feeling was mutual! In this footage, the two meet and enjoy a special day that ends with Koko signing to Mister Rogers that she "Love[d] Visit," setting the stage for a strong friendship. | Koko & The Gorilla Foundation

Koko's Kitten Playdate... In this archival footage, Koko meets and plays with one of her many pet kittens. These clips show Koko as she first introduces herself to the cat, cuddles with him, and carries him around to show him features of her room such as her full-length mirror. Her ability to gently and purposefully share experiences with her kittens demonstrates her empathy and capacity to form meaningful friendships with any species. | Koko & The Gorilla Foundation

[Video] Koko the Gorilla Celebrates Her Birthday with Adorable Kittens—[Full story in cᴑmments]👇 | Nature and Wildlife TV

28K views · 887 reactions | This incredible gorilla used sign language to ask for the perfect birthday present: A box of kittens. Watch Koko and her unlikely friends hit it off in this clip from The Lift: America's First Mobile Morning Show.. | The Weather Channel | Facebook