Who first laughed man or monkey?

Maybe the monkey. If so far it was thought that primates were laughing only for imitation, now we know that is not so. Thanks to a study conducted by some researchers at the University of Portsmouth (England) who had fun tickling at about twenty of the Oranges, Gorillas, Bonobos and Chimpanzees.Comparing laughter to those of some children, they found that monkeys not only laugh like us, using the same physical mechanisms (type of breathing, sound emission), but also for the same reasons: when they experience an emotion. And the first true "joker" in history could have been the common ancestor of man and monkey who probably lived tens of millions of years ago.