Listen to this rat 'laugh' when tickled

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skonecny2004
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You are listening to a rat being tickled. It's making high-pitched, ultrasonic squeaks, considered the rat’s equivalent of laughter. The sounds are audible through a special microphone. Researchers were able to elicit these responses by stimulating neurons in the brain tied to ticklishness and laughter.
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Tickling and Bondage
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