Researchers from the University of California concluded that the apes also laugh when they play.
One of our fundamental exclusiveness-laugh-just succumb. Experts in the field have discovered that primates do something similar, plus what was already known and was called "teeth bared, a retraction of the lips is nothing that a stimulus versus fear conditions.
Actually, now comes to know that there is an expression in chimps and relaxed open mouth and usually associated with gambling, and often is accompanied by a short vocalization, which is the accurate characterization of a laugh.
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