ROBIN Williams' tragic suicide has knocked the showbiz world for six.
Many of the comic actor's friends and former colleagues have shared tributes following his sudden passing, aged 63.
And the mourning has even extended to the animal kingdom - with a gorilla Robin met in the 1980s also expressing her sadness.
Koko, who Robin spent time with in 2001, can communicate with sign language and can understand more than 1,000 signs.
This week, learning of the Good Will Hunting star's death from her trainer Penny Patterson, Koko made the sign for 'cry lip', and bowed her head, with her lip quivering.
Penny also released a statement remembering Robin's visit.
"Robin's ability to just 'hang out' with Koko, a gorilla, and in minutes become one of her closest friends, was extraordinary and unforgettable for Koko," she said.
Related article: Rickly Gervais pays tribute to Robin Williams
"We hope that when you remember Robin Williams, you'll remember that he is not only one of the world's most beloved entertainers but also one of the world's most powerful ambassadors for great ape conservation."
Sent from my BlackBerry® wireless handheld from Glo Mobile.