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That ‘killer’ spider story you read online? Fake news, most probably

A wasp spider (Argiope bruennichi). Image by Krzysztof Niewolny via Unsplash.

  • Media coverage of human encounters with spiders is rife with misinformation, according to a study by more than 60 scientists around the world.
  • They compiled a database of more than 5,300 news articles from 81 countries about these encounters, and found 47% had factual errors and 43% were sensationalistic.
  • They also found stories that quoted spider experts tended to be more accurate than those that quoted medical experts of pest control specialists, who don’t receive the same level of training.
  • Negative media portrayals of spiders, snakes and other animals that many people tend to dislike hurt efforts to conserve species that play an important role in the ecosystem, the study authors say.

The prevalence of political and scientific misinformation in the media is a hot-button topic these days, and rightfully so — it has serious negative consequences for society. Emerging research shows that not even the animal kingdom is safe from the dangers of misinformation: a new study has quantified the global spread of misinformation about spiders, yielding clues about how to stem the flow of falsehoods.

The research, posted as a pre-print and currently under peer review, is the product of a massive effort by more than 60 scientists around the world led by ecologist Stefano Mammola of the Italian National Research Council. They compiled a database of 5,348 news articles about human-spider encounters from 81 countries and written in 41 languages.

Mammola and his colleagues analyzed each article in the database, recording whether they contained factual errors about spiders and whether they used sensationalistic language and/or images, such as the words “killer,” “terror” and “nightmare,” to describe the encounters. They found the articles were rife with misinformation: nearly half (47%) of the total news articles contained factual errors, and 43% were sensationalistic.

According to Mammola, spiders are a perfect focal organism for examining scientific misinformation in the media because they arouse a lot of emotion — much of it fear — in humans. Media outlets capitalize on these strong emotions to get readers to click on their articles.

Sensationalized headlines about spiders.
Sensationalized headlines about spiders. Researchers found that nearly half (47%) of the total news articles contained factual errors, and 43% were sensationalistic.

Study co-author Catherine Scott, a postdoctoral fellow at the Lyman Entomological Museum at McGill University in Canada, agrees. “People love to hate spiders. They occupy this place in our minds, and I think it has something to do with how different they are from us. They’re almost alien … they have eight legs, they have lots of eyes, they move in an erratic way,” they explained, noting that even some entomologists, scientists who study insects (which have six legs), are afraid of the eight-legged animals.

Scott said they empathize with people who fear spiders. As a child and teenager, they were also arachnophobic, to the point that they couldn’t be in the same room with a spider. But their fear turned to curiosity when they had the opportunity to research black widow spider communication as an undergraduate student. After observing the spiders’ sophisticated behaviors and communication systems, Scott “very rapidly switched from being arachnophobic to arachnophilic [spider-loving].” And there is a lot to love about these animals: spiders fill an important ecological role as predators of household and agricultural pests. A 2017 study estimated that the world’s spiders collectively devour 400 million to 800 million metric tons of insects and other tiny prey each year.

Today, Scott is a spider scientist who focuses on combating misinformation about these creatures. “It’s a constant frustration for me as an arachnologist to see sensationalized media stories, to see information being spread on the internet that is false,” they said. Scott even started a Twitter project called #RecluseOrNot to correct misinformation about brown recluse spiders on social media.

A brown recluse spider (Loxosceles reclusa).
A brown recluse spider (Loxosceles reclusa). Image by Rosa Pineda via Wikimedia Commons (CC BY-SA 3.0).

A key finding of this new study is that, although factual errors and sensationalism in news media about spiders is widespread, such misinformation was less common when reporters sought commentary from spider experts. This was not the case when reporters consulted pest control or medical experts, who do not receive the same level of training as spider specialists do.

For Mammola, this finding demonstrates how important it is that journalists seek out the right type of expert to comment on scientific stories, not just any expert. Scott said it’s an encouraging finding, because “it means there is an easy fix.” The research group is currently composing guidelines for journalists reporting on spiders. The group also intends to compile a database of spider experts available to speak with the media to make it easier for journalists to find high-quality sources.

Because they were a global team, Mammola and his colleagues were also able to construct a network of how information — and misinformation — about spiders flows around the world. They saw how even very specific, local stories could spread worldwide. “A single spider event occurring in a small town in Michigan can be taken up by the global press, which for me was quite amazing,” he said. One reason this happens? “If something is particularly stupid,” Mammola said, recounting a viral story of a man being bitten on the genitals by a spider as an example.

Emily Geest, an ecologist and postdoctoral fellow at Oklahoma State University who was not involved in the study, said she was particularly impressed by its worldwide coverage. “To see those patterns, globally, is really intense,” she said.

Geest has previously published research on the moral depictions of animals in comic books. She said she knows how media portrayals can fan the flames of fear, particularly for animals such as snakes and spiders that people are predisposed to dislike.

These negative media portrayals have real-world repercussions for animals, particularly on conservation efforts. “The ultimate problem is, I think, that we will spend less and less resources to preserve spider species, just because we fear them and we have this societal and political perception about them,” Mammola said.

Geest said she’s also concerned about the effect of misinformation on the public perception of conservation funding, which could disadvantage species that are ecologically important but not beloved. “When you see organizations like zoos and aquariums putting money into trying conserve species that aren’t well-liked, there is this disconnect where the public doesn’t see the value in them,” she said. “And if they don’t see the value in them, they’re not going to support policies around it.”

A Jorō spider (Trichonephila clavata).
The Jorō spider (Trichonephila clavata), native to East Asia and an introduced species in the U.S., was the subject of sensationalistic news in the U.S. earlier this year. The news spread across many countries. Image by Christina Butler via Wikimedia Commons (CC BY 2.0).

Misinformation also has economic and even, for some people, personal consequences beyond the conservation sphere. The study cites stories of unnecessary school closures in the U.K. due to spider “invasion” as one example. In another, a man accidentally set his home on fire trying to clear spiderwebs from his yard with a blowtorch.

Dispelling and, ultimately, preventing the spread of such misinformation is key for both spiders and people. With that goal in mind, Geest said one important strength of the new study is that it’s so relatable. “Everybody has a spider story,” she said. Educating people about why spiders should be protected and, more generally, about positive human-wildlife interactions is critical as humans continue to infringe on other species’ habitats. As is true for most (if not all) species, spiders have more to fear from us than we do from them.

While this study offers tips for journalists to avoid creating spider misinformation, its lessons are also applicable to media consumers. First, beware of overly emotional or fear-mongering language and images in wildlife stories. And, keep in mind that articles about spiders with commentary from actual spider experts — zoologists, arachnologists and ecologists — are less likely to include misinformation than articles that feature doctors and pest control experts, who generally don’t have training in spider behavior and ecology. For example, medical experts may mistake tick bites or skin infections for spider bites. When this misclassification makes the news, it becomes misinformation.

Mammola said he hopes to apply the same methodology from this spider study to articles about other animals like scorpions and jellyfish to see if they’re also subject to the same level of misinformation. In the meantime, a simple piece of advice should suffice for anyone who consumes news or social media: Don’t believe everything you read on the internet.

Banner image: A wasp spider (Argiope bruennichi). Image by Krzysztof Niewolny via Unsplash


Mammola, S., Malumbres-Olarte, J., Arabesky, V., Barrales-Alcalá, D. A., Barrion-Dupo, A. L., Benamú, M. A., … Scott, C. (2022). The global spread of (mis)information on spiders. doi:10.21203/

Mammola, S., Malumbres-Olarte, J., Arabesky, V., Barrales-Alcalá, D. A., Barrion-Dupo, A. L., Benamú, M. A., … Chuang, A. (2022). An expert-curated global database of online newspaper articles on spiders and spider bites. Scientific Data9(1). doi:10.1038/s41597-022-01197-6

Vetter, R. S. (2013). Arachnophobic entomologists: When two more legs makes a big difference. American Entomologist59(3), 168-175. doi:10.1093/ae/59.3.168

Nyffeler, M., & Birkhofer, K. (2017). An estimated 400-800 million tons of prey are annually killed by the global spider community. The Science of Nature104(3-4). doi:10.1007/s00114-017-1440-1

Geest, E. A., Knoch, A. R., & Shufran, A. A. (2021). Villainous snakes and heroic butterflies, the moral alignment of animal-themed characters in American superhero comic books. Journal of Graphic Novels and Comics, 1-16. doi:10.1080/21504857.2021.1998173

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