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that the twins "inherited some aspects of their laugh sound and pattern, readiness to laugh, and maybe even taste in humor".

Scientists have noted the similarity in forms of laughter induced by tickling among various primates, which suggests that laughter derives from a common origin among primate species.

The spotted hyena, another species of animal, was also known as the laughing hyena because of the way it sounds when it communicates.

A very rare

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