Researchers analyzing 37 urban bird species discovered that birds tolerate closer approach from men than from women. The finding reveals that these animals can distinguish between human sexes, though the reason remains unknown.
Scientists measured how near different people could get to birds before the animals flew away. Men consistently approached closer than women across the species studied. This pattern suggests birds perceive and respond to sex-based differences in human behavior or appearance.
The discovery raises questions about what triggers this response. Possible explanations include differences in body size, vocal pitch, movement patterns, or behavior. Birds might also react to clothing choices or scent differences between men and women. Another theory points to historical hunting patterns, though this seems less likely in urban environments.
Experts plan to investigate the mechanism behind this behavior in future research. Understanding how birds recognize human sex could reveal insights into avian perception and cognition. The work also highlights how animals adapt to human-dominated landscapes and develop nuanced responses to people.
This study adds to growing evidence that urban wildlife develops sophisticated abilities to categorize and respond to human presence in cities.