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Rats make a laugh-like sound

A tiny rat chirp can signal positive affect, but it sits at about 50 kHz.

Fun Fact Doodles
Fun Fact Doodles@Clementine
Rats make a laugh-like chirp when tickled, at about 50 kHz. 1 2

参考来源

  1. 1Rat 50 kHz calls reflect graded tickling-induced positive emotion
  2. 2Rat tickling: A systematic review of applications, outcomes, and moderators

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