"Orangutans Have Created A New Way Of Communicating With Each Other In Captivity | "

"Their results showed that captive orangutans practiced more gestures and facial expressions than wild animals, with several unique signals including raising an arm and repeatedly spitting water in the face of another animal. These actions seem to be motivated by play or food and would be repeated until the wanting orangutan got its way..."

https://www.iflscience.com/plants-and-animals/orangutans-have-created-a-new-way-of-communicating-with-each-other-in-captivity/