Gone with the wind: Windy spider webs host fewer thieves

Can wind determine where animals choose to live? Our new study, published in The Science of Nature, suggests that it can! Even for tiny kleptoparasitic spiders that spend their lives stealing food from much larger orb-weaving spiders.

During a student field course in Madagascar, we noticed that webs of the giant golden orb-weavers (Trichonephila inaurata, family Nephilidae), exposed to strong wind, appeared to contain fewer kleptoparasitic spiders than similarly sized, more sheltered webs. To test this observation, we surveyed 60 webs over the course of a single afternoon, measuring both web size and how much each web swayed in the wind.

The results were striking: webs that moved more in the wind consistently hosted fewer kleptoparasites, even after accounting for web size, the strongest predictor known until now. Wind therefore appears to represent an overlooked environmental factor shaping where these tiny spider "thieves" choose to live.

The study also highlights the value of field courses and curiosity-driven research. A casual observation in the field became a published study, reminding us that even well-studied systems can still hold surprising discoveries.

Agnarsson, I., Ólafsson, O. T., Martinsson, G. M., Þorsteinsson, I., Arinbjörnsdóttir, M., & Gregorič, M. 2026. Gone with the wind: wind-induced web movement reduces kleptoparasite abundance in a golden orbweaver spider. The Science of Nature 113: 82.

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