May 7, 2026, 3:12 pm | Read time: 5 minutes
How close can you get to a bird before it takes flight? If you walk your dog in the park or enjoy watching animals, you’ve probably asked yourself this question. A new Europe-wide study now provides a surprising answer: It depends not only on your behavior but also on whether you are a woman or a man. And the result is likely to surprise many.
Birds Are More Sensitive to Women
The international research team led by Federico Morelli closely examined the flight behavior of birds in several European cities. The focus was on a previously little-studied question: Does it matter to birds who approaches them–whether it’s a woman or a man?
The result is surprisingly clear: On average, the animals took flight earlier when approached by women than by male observers. Birds maintained a slightly larger “safety distance” from women–an effect that was consistent across different countries and bird species.
Why Flight Decisions Are Crucial for Survival
For wild animals, every encounter with a potential “enemy” is a matter of cost and benefit. If they flee too early, they lose valuable time for foraging or other important activities. If they wait too long, the situation can quickly become life-threatening. This behavior is accordingly finely tuned.
This behavior is scientifically measured by the so-called “Flight Initiation Distance” (FID)–the distance at which an animal takes flight. The greater this distance, the more cautious the animal.
Many factors influence this decision, such as habitat, group size, or human behavior. However, whether the gender of the person plays a role had not been investigated until now.
How the Study Was Conducted
In spring 2023, researchers collected data in urban green spaces in Germany, Poland, the Czech Republic, Spain, and France. A total of 2,701 observations were conducted on 77 bird species. For the main analysis, the team used 2,581 measurements from 37 species.
The study design was very meticulous. A female and a male observer worked in the same area. Clothing and body size were matched as closely as possible. The approach was always the same–in a straight line, at a constant pace, and with direct eye contact.
Additionally, the scientists recorded other factors such as vegetation, group size, or starting distance to isolate the influence of gender as much as possible.
The Result: A One-Meter Difference
The data shows a clear and consistent pattern across all the countries studied: Birds typically flee at 8.5 meters from women, compared to 7.5 meters from men.
This corresponds to a difference of about one meter or approximately 11 percent–a surprisingly significant effect for such a sensitive behavior, observed regardless of the study location. Additionally, it was found that male birds are bolder than females. They allow humans to get closer before taking flight.
Other factors also showed clear correlations:
- The greater the initial distance, the sooner the animals took off–presumably because a longer approach is perceived as more threatening.
- More trees led to more cautious behavior, while bushes tended to encourage shorter flight distances.
- Group size, however, did not play a clear role.
What Does This Mean for You as an Animal Lover?
The study impressively shows that birds perceive their environment much more distinctly than previously thought. They react not only to obvious stimuli like quick movements or conspicuous clothing but possibly also to subtler differences between people. Even when approach and external conditions are largely standardized.
For us, this means that our own behavior has a greater impact than previously assumed. Not only how quickly or directly you approach matters–but possibly also less obvious factors.
Why Do Birds React This Way?
The most intriguing question remains unanswered: Why do birds flee earlier from women than from men?
The researchers cannot yet provide a definitive answer but discuss various possible explanations. Differences in movement patterns or posture, which birds perceive differently, are conceivable. Visual characteristics could also play a role–even when clothing and external factors were largely matched in the experiment. Another possibility is scents, which animals may perceive more sensitively.
However, none of these hypotheses have been proven so far. The mechanisms behind the behavior remain unclear.
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Are There Limitations?
Despite the strong data foundation, some open questions remain. Even with standardized clothing, subtle differences in behavior or scent cannot be completely ruled out. Additionally, only urban birds were studied. These animals are accustomed to human proximity and might react differently than birds in rural or less disturbed areas.
Whether the results can be applied to other habitats or even other animal species is still unclear.
Conclusion
The study provides the first clear evidence that a person’s gender influences bird behavior. They react more cautiously to women and typically flee about a meter earlier from them than from men. For science, this is an important indication to consider human factors more in the future. For animal lovers, it is above all a fascinating proof of how finely animals perceive their environment.
And perhaps on your next walk in the park, you’ll consciously observe how close you can actually get to a bird.