Does the animal have a sense of humor

  There is a female gorilla named Koko at Stanford University. Under the teaching of Professor Francine Patterson, she has learned more than 1,000 sign language words and can basically communicate with humans without obstacles. Once, someone asked it: “What is hard?” It replied: “Rock and work.” He cleverly used the word hard in English to make a little joke. Another time, it tied Professor Patterson’s shoelaces together and made a “come after me” action.
   Although rigorous scientists are not completely convinced of such a case, things like “funny” are really not easy to repeat-in a rigorous laboratory, no funny things can be laughed out. So witty scientists came up with a way: scratch it.
   Sure enough, the laughter of chimpanzees and bonobos when they are tickled is basically the same as the laughter they make when they are fighting. Further research found that not only the orangutans, but even the white mice. The sound they make when they are really bullied is obviously different from the sound they make when they are joking and squatting, and the laughter they make when they are being slapped is the same as when they are tickled. Through these laughs, they actually send a signal: “We are just playing and will not hurt each other.”