Koko, a sad gorilla, spent more than 6 months without smiling after losing Michael, her best friend, to death! However, Robin Williams, a great comedian, went to visit her in 2001, and was able to make her smile!

The comedian and gorilla had a great, deep bond, that is irreplaceable. Robin Williams did not think twice to help Koko after receiving a call from the Gorilla Foundation.

As soon as Robin Williams entered the room, Koko was interested in him. Robin was then told with signs by Koko to follow and tickle her! And she started smiling once he did that! It was a great moment for all the caretakers! Watch the video below.

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