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Laughter in animals other than humans describes animal behavior which resembles human laughter. Several non-human species demonstrate vocalizations that sound similar to human laughter. A significant proportion of these species are mammals, which suggests that the neurological functions occurred early in the process of mammalian evolution. [ 1 ]
Laughter is a pleasant physical reaction and emotion consisting usually of rhythmical, usually audible contractions of the diaphragm and other parts of the respiratory system. It is a response to certain external or internal stimuli. Laughter can rise from such activities as being tickled, [1] or from humorous stories, imagery, videos or ...
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Detail of the Mona Lisa, who is known for her smile. A smiling child. A smile is a facial expression formed primarily by flexing the muscles at the sides of the mouth.Some smiles include a contraction of the muscles at the corner of the eyes, an action known as a Duchenne smile.
Laughter-like behavior is not unique to humans, but humans do display a much more consistent and complex use of humor and laughter than other animals. [6] The evolution and functions of laughter and humor have been explored in an attempt to understand how and why humor and laughter have become part of human existence.