White streetlights can trap pill bugs in giant death spirals, study finds
Researchers in Israel have discovered that artificial white streetlights can cause pill bugs to gather in large, synchronized circles until they die of exhaustion. This behavior, observed in the species Armadillo sordidus, suggests that light pollution significantly disrupts the natural patterns of small crustaceans.
Why it matters
This study provides new evidence of how human-made light pollution can have lethal, unintended consequences on local ecosystems and insect behavior.
On most nights, streetlights are just background—small circles of brightness cutting through the dark. But for a tiny, overlooked group of creatures living close to the ground, those circles of light can become something far stranger: a kind of glowing trap that draws them into huge, synchronized “death spirals.”That’s what researchers in Israel discovered when they started paying close attention to the behaviour of land‑dwelling isopods—little crustaceans better known as woodlice or pill bugs. These are the same small, segmented animals you might see curling into balls under rocks or in damp garden soil. They usually live quietly, hidden and alone.
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