Does laughter equate Humanity? I've never heard of an animal that can laugh, truly laugh, with an actual sense of humour. I've heard of monkeys and chimpanzees laughing in zoo's, but wouldn't that just be imitated behaviour? Not an actual sense of humour? Could it be argued that laughter is an indicator of Humanity? Could it be one of the few signs of Humanity? Or is humour simply the outcome of a higher intelligence? After all, boredom is also a solely Human trait. Thoughts?