Actually what happen was a female caregiver that also worked with Robin Williams was crying from just hearing that Robin Williams passed away. Koko became sad when she was told and when she saw the woman crying she did the sign for woman and cry. She than bowed her head and her lip began to quiver.
Sadly Gorillas are unable to make tears from sadness. They instead use their body language to show sadness or will cry out with their voice.
This isn't the first time she did the cry sign yes she did it for All Ball but also for her Gorilla friends who died and she did it when watching sad movies.
Both were two amazing souls who we are truly lucky to have had as long as we did.
Sadly Gorillas are unable to make tears from sadness. They instead use their body language to show sadness or will cry out with their voice.
This isn't the first time she did the cry sign yes she did it for All Ball but also for her Gorilla friends who died and she did it when watching sad movies.