An international research team has documented that urban birds exhibit different avoidance behaviors depending on the sex of approaching humans. The study involved male and female participants walking toward birds in city parks across five European countries, with researchers measuring how close individuals could approach before birds took flight. Results showed that men were able to get approximately one meter closer than women before birds fled, regardless of whether the observer’s height and clothing were matched.
The research examined 37 bird species across Czechia, France, Germany, Poland, and Spain, including species such as great tits, house sparrows, blackbirds, magpies, and pigeons. The consistent pattern across diverse species and geographic locations suggests that urban birds possess the ability to distinguish between male and female humans. The findings were published in the British Ecological Society journal People and Nature and employed comparative analysis techniques to ensure consistency of results.
Despite documenting the phenomenon across more than 2,700 observations, researchers acknowledge they cannot currently explain the underlying cause. Scientists have proposed various hypotheses, including the possibility that birds respond to chemical signals such as pheromones, differences in body shape, or variations in movement patterns between men and women. Professor Daniel Blumstein of UCLA noted that while the results are convincing, the mechanism remains unknown.
The discovery has implications for urban ecology research and raises questions about assumptions made in behavioral studies. Researchers emphasize that their findings are preliminary and note that follow-up investigations will be necessary to determine whether the pattern holds in different settings and populations. Future research may focus on testing individual factors separately to identify the specific cues that urban birds use to distinguish between human observers.
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