Rats laugh when they're tickled, it's just so high-pitched that humans cannot hear it.
Source: https://www.science.org/content/article/watch-these-ticklish-rats-laugh-and-jump-joy
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Fact #3
Rats laugh when they're tickled, it's just so high-pitched that humans cannot hear it.
Source: https://www.science.org/content/article/watch-these-ticklish-rats-laugh-and-jump-joy