ko. live in stanford this morning, sharon, the video is so nice to see. ko koo touched a lot of lives, including yours. ko also lives, including yours. >> reporter: she did. my kids learned all about her in school. this is touching many children at home. i'm sure they are sad to hear the news, just waking up and hearing the news. people around the world just amazed by koko's communication skills. koko was born in san francisco in the san francisco zoo. dr. penny patterson taught her sign language at the stanford university project that started in 1974. many celebrities met koko including mr. rogers. she's been the star in documentaries, national geographic. the late robin williams met her. she mastered sign language. >> i have three gorillas. they think i'm insulting my children. my children are gorillas, i'm sorry. >> reporter: koko loved kittens. she expressed sorrow when her kitten died t many have read that story to my children. the gorilla foundation said koko's legacy will live on, basically teaching many children about the importance of sign language and