In humans, urinating together can be seen as a social phenomenon. An Italian proverb states, 'Whoever doesn't pee in company is either a thief or a spy'. This behaviour is represented in art across centuries.
Researchers from Kyoto University found that chimpanzees are more likely to urinate when they see others doing it, indicating that this phenomenon may have deep evolutionary roots.
The study revealed that chimpanzees tend to urinate in response to the urination of nearby individuals, demonstrating a significant synchrony among primate urination events.
Our research found that chimpanzees who have less social status are more likely to copy another chimp who has just urinated, showing a social behavioral response.
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