Koko, a gorilla who mastered some rudimentary sign language, has died in her sleep at the age of 46.
Two years ago, the Gorilla Foundation arranged to have Flea of Red Hot Chili Peppers give Koko a bass guitar lesson. They filmed Flea watching her in awe as she attempted to play the instrument. The footage went viral after it was posted on the Internet. At the time Flea wrote, "My sweet and true friend Koko rocks a flea bass like it ain't nuthin'."
The Chili Peppers re-posted the video on their social media today along with the comment "R.I.P. Koko...Support The Gorilla Foundation (@kokotweets) here: koko.org."