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Streetlights trigger bizarre 'death spirals' in thousands of isopods, scientists find

Phys · · 632 words · By Hebrew University
Animal Behavior Ecological Impact Light Pollution

Researchers from The Hebrew University of Jerusalem have documented a phenomenon where land-dwelling isopods form massive circular processions in response to artificial white light. The study suggests that streetlights disrupt the natural instincts of these creatures, potentially increasing their vulnerability to predators.

open_in_new Read the original article: https://phys.org/news/2026-05-streetlights-trigger-bizarre-death-spirals.html

analyticsAnalysis

10%
Propaganda Score
confidence: 95%
Low risk. This article shows minimal use of propaganda techniques.

psychologyDetected Techniques

warning
Loaded Language 70% confidence
Using words with strong emotional connotations to influence an audience.

fact_checkFact-Check Results

11 claims extracted and verified against multiple sources including cross-references, web search, and Wikipedia.

info Single Source 7
help Insufficient Evidence 2
verified Verified By Reference 1
schedule Pending 1
info
“A new study led by Ph.D. student Idan Sheizaf, under the guidance of Prof. Ariel Chipman from The Hebrew University of Jerusalem, has documented a never-before-seen behavioral phenomenon: thousands of land-dwelling isopods forming massive, synchronized circular processions.”
SINGLE SOURCE
The claim is explicitly supported by one web search result ('Streetlights trigger bizarre 'death spirals'...'), but no other independent news sources or authoritative references corroborate the specific study by Idan Sheizaf and Ariel Chipman.
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web search NEUTRAL — Ariel Chipman studies gene content evolution in the Arthropods.
https://www.bio.huji.ac.il/en/content/chipman-ariel
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web search NEUTRAL — Ariel Chipman from The Hebrew University of Jerusalem, has documented a never-before-seen behavioral phenomenon: thousands of land-dwelling isopods forming massive, synchronized circular processions.
https://phys.org/news/2026-05-streetlights-trigger-bizarre-d…
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web search NEUTRAL — Arad Jerusalem, documenting its use in a Jewsih temple site from 800 BCE.
https://www.tandfonline.com/doi/full/10.1080/03344355.2020.1…
info
“The study, published in Ecology and Evolution, explores how these small creatures... join swirling 'mills' that can include over 5,000 individuals in a single group.”
SINGLE SOURCE
The specific detail about 'mills' of over 5,000 individuals is mentioned in the same single source as claim 0. While Wikipedia confirms the existence of the journal 'Ecology and Evolution', it does not confirm the specific findings of this study.
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wikipedia NEUTRAL — Ecology (from Ancient Greek οἶκος (oîkos) 'house' and -λογία (-logía) 'study of') is the natural science of the relationships among living organisms and their environment. Ecology considers organism…
https://en.wikipedia.org/wiki/Ecology
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wikipedia NEUTRAL — Ecology and Evolution is a biweekly open-access scientific journal covering all areas of ecology, evolution, and conservation. The Editors in Chief of this journal are Allen Moore, Andrew Beckerman, J…
https://en.wikipedia.org/wiki/Ecology_and_Evolution
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wikipedia NEUTRAL — Nature Ecology & Evolution is an online-only monthly peer-reviewed scientific journal published by Nature Portfolio covering all aspects of research on ecology and evolutionary biology. It was establi…
https://en.wikipedia.org/wiki/Nature_Ecology_&_Evolution
+ 3 more evidence sources
info
“The behavior was first brought to the scientists' attention by amateur naturalist Eviatar Itzkovich, who spotted the swirling masses on summer nights in the Golan Heights.”
SINGLE SOURCE
The role of Eviatar Itzkovich in observing the behavior in the Golan Heights is mentioned only in the single source ('Streetlights trigger bizarre 'death spirals'...').
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web search NEUTRAL — A chance discovery in the Golan Heights. The behavior was first brought to the scientists' attention by amateur naturalist Eviatar Itzkovich, who spotted the swirling masses on summer nights in the Go…
https://phys.org/news/2026-05-streetlights-trigger-bizarre-d…
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web search NEUTRAL — The Golan Heights, (Hebrew: רמת הגולן,Ramat HaGolan), or simply the Golan, is a region in the Levant, spanning about 1,800 square kilometers (690 sq mi).
https://www.youtube.com/watch?v=q3JYHC9B-kk
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web search NEUTRAL — (Update 2021) Amateur Naturalists; A Tim Sparks slides a small leather-bound notebook out of an envelope. The book’s yellowing pages contain beekeeping notes made between 1941 and 1969 by the late Wal…
https://ieltsquangtri.com/amateur-naturalists/
verified
“The research centered on the species Armadillo sordidus, which, like most isopods, lives under stones and in damp debris to avoid drying out.”
VERIFIED BY REFERENCE
Wikipedia confirms that Armadillo sordidus is a species of crustacean (isopod). General knowledge of isopod biology (woodlice) confirms they live under stones and in damp debris to avoid desiccation.
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web search NEUTRAL — Species is a word for a particular kind of living thing, for example, a jackdaw. Jackdaws and ravens are similar, so they are together in a larger group (taxon) called a genus, in this case Corvus.
https://simple.wikipedia.org/wiki/Species
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web search NEUTRAL — Species: Directed by Roger Donaldson. With Natasha Henstridge, Michael Madsen, Ben Kingsley, Alfred Molina. A group of scientists try to track down and trap a killer alien seductress before she succes…
https://www.imdb.com/title/tt0114508/
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web search NEUTRAL — Mar 23, 2026 · Species, a level of biological classification comprising related organisms that share common characteristics and are capable of interbreeding. According to standard taxonomic convention…
https://www.britannica.com/science/species-taxon
info
“while previously known only in southern Syria and the Golan Heights, this study marks the first time they have been described in the Jezreel Valley.”
SINGLE SOURCE
While Wikipedia confirms the location of the Jezreel Valley, the specific claim that this study marks the first time Armadillo sordidus was described there is only found in the single source reporting the study.
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web search NEUTRAL — The Jezreel Valley, or Marj ibn Amir is a large fertile plain and inland valley in the Northern District of Israel. It is bordered to the north by the highlands of the Lower Galilee, to the south by t…
https://en.wikipedia.org/wiki/Jezreel_Valley
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web search NEUTRAL — Today, the Jezreel Valley is Israel’s breadbasket. A beautiful plain of fertile fields and winding roads, it’s hemmed in by rolling mountains that offer stunning scenic views. modern-day Jezreel Valle…
https://www.logos.com/grow/is-the-jezreel-valley-the-stage-f…
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web search NEUTRAL — Jezreel was located in one of the most coveted, fertile regions in the kingdom, and at Shechem one could find the great tree of Moreh, an altar that Abraham built, and Joseph’s bones, not to mention t…
https://armstronginstitute.org/748-uncovering-the-bibles-bur…
info
“The isopods showed no reaction [to strong magnets], maintaining their circular march.”
SINGLE SOURCE
The specific experimental result regarding magnets is not found in any of the provided evidence except for the implied context of the single source reporting the study.
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web search NEUTRAL — Armadillos (Spanish for 'little armored ones') are placental mammals in the order Cingulata. They form part of the superorder Xenarthra, along with the anteaters and sloths.
https://en.wikipedia.org/wiki/Armadillo
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web search NEUTRAL — Armadillo sordidus är en kräftdjursart som beskrevs av Helmut Schmalfuss 1996. Armadillo sordidus ingår i släktet Armadillo och familjen Armadillidae. Inga underarter finns listade i Catalogue of Life…
https://sv.wikipedia.org/wiki/Armadillo_sordidus
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web search NEUTRAL — Armadillo sordidus. Filter by Place.The current Computer Vision Model does not know about this taxon, so while it might be included in automated suggestions with the "Nearby" label, it will not have t…
https://www.inaturalist.org/taxa/1129568-Armadillo-sordidus
info
“Testing with UV flashlights attracted only a small fraction of the population and failed to trigger any circular movement.”
SINGLE SOURCE
The specific experimental result regarding UV flashlights is not corroborated by any independent source provided.
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web search NEUTRAL — Ultraviolet radiation (UV; sometimes called ultraviolet light) is electromagnetic radiation of wavelengths of 100–400 nanometers, shorter than that of visible light, but longer than X-rays.
https://en.wikipedia.org/wiki/UV
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web search NEUTRAL — Apr 24, 2026 · Ultraviolet radiation is the portion of the electromagnetic spectrum extending from the violet, or short-wavelength, end of the visible light range to the X-ray region.
https://www.britannica.com/science/ultraviolet-radiation
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web search NEUTRAL — Apr 1, 2023 · Ultraviolet light or UV is electromagnetic radiation in the wavelength range of 10 to 400 nanometers (nm), which is between x-rays and visible light. Because it is largely invisible to h…
https://sciencenotes.org/ultraviolet-light-or-uv-radiation/
info
“When a white lamp was placed perpendicular to the ground, it consistently induced the mass circular motion.”
SINGLE SOURCE
The specific finding that a white lamp placed perpendicular to the ground induces circular motion is explicitly mentioned in the single source ('Streetlights trigger bizarre 'death spirals'...').
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web search NEUTRAL — When a white lamp was placed perpendicular to the ground, it consistently induced the mass circular motion. The researchers discovered that the geometry of the light is the key. A vertical light beam …
https://phys.org/news/2026-05-streetlights-trigger-bizarre-d…
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web search NEUTRAL — Armadillo, (family Dasypodidae), any of various armoured mammals found mainly in tropical and subtropical regions of Central and South America. Most of the 20 species inhabit open areas, such as grass…
https://www.britannica.com/animal/armadillo-mammal
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web search NEUTRAL — The moment of inertia of the remaining part of the ring about an axis passing through the centre of the ring and perpendicular to the plane of the ring is k times MR2 .269 KEAMKEAM 2009System of Parti…
https://tardigrade.in/question/from-a-circular-ring-of-mass-…
help
“the sex ratio, mostly females, many of whom were carrying eggs, suggests this isn't a mating ritual.”
INSUFFICIENT EVIDENCE
No evidence was found in the provided search results regarding the sex ratio or egg-carrying status of the isopods in these mills.
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“In one observation, a centipede was seen preying on the distracted, swirling mass.”
INSUFFICIENT EVIDENCE
No evidence was found in the provided search results regarding centipedes preying on these specific swirling masses.
schedule
“Idan Sheizaf et al, A Novel Light‐Induced Collective Circular Movement in Armadillo sordidus Isopods, Ecology and Evolution (2026). DOI: 10.1002/ece3.73487”
PENDING
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.