Pic: Koko the Gorilla mourning Robin Williams: "Dr. Patterson told Koko that 'we have lost a dear friend, Robin Williams.' Koko signed 'CRY LIP,' withdrew, and 'became very somber, with her head bowed and her lip quivering.'"

via /r/pics http://www.reddit.com/r/pics/comments/2deman/koko_the_gorilla_mourning_robin_williams_dr/