Nonhuman creatures are capable of laughter (e.g., rodents). They can make a noise researchers have identified as giggling. (Beck, Martha, PhD. The Joy Diet. p 153-154. NY: Crown Publishers, 2003.)

Although previously believed that laughter was uniquely human, laughter is not confined to humans. Animal studies on rats, monkeys and dogs, show that certain sounds they make are indicative of laughter. Rat pups, for example, emit short, high frequency, ultrasonic vocalizations when playing with each other, and when tickled. Rat pups "laugh" far more than older rats. Monkeys also appear to make laughing noises during play and interaction. Chimpanzees show laughter-like behavior in response to physical contact, such as wrestling, chasing, or tickling. Chimpanzee laughter is not readily recognizable to humans as such, because it is generated by alternating inhalations and exhalations that sound more like breathing and panting. The chuff or huff of a dog when he/she is excited to see you all suggest these animals laugh. Intelligence studies on dolphins have shown that two dolphins can refer to a third dolphin by name. Who can say they’re not telling a joke, or capable of laughing during play? (Source)

Laughter is the most enjoyable form of human communication. Humans are the only animals able to appreciate all the shadings of humor; it integrates the limbic system with the frontal lobes. (Donahue, Phil. The Human Animal. p 331-334. NY: Simon & Schuster, 1985, 1986.)

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