Rats showcase a unique form of communication by emitting ultrasonic calls during their playful and social interactions, which are inaudible to humans. Often occurring at a frequency of 50 kHz, these vocalizations are associated with moments of joy and positive emotional states. For instance, tickling a rat may elicit these high-pitched chirps, known as ‘rat laughter.’ This exciting research reveals an intricate layer of animal social behavior and emotional expression.
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