The rare phenomenon of a “spider rain” struck fear into the hearts of locals.

Rare ‘spider rain’ phenomenon goes viral and leaves residents in Brazil shocked

Residents of Sao Thome das Letras in Brazil were left terrified by a spine-tingling “rain of spiders.”

Hundreds of the Parawixia bistriata species took to the sky, weaving an intricate web high above as part of their breeding and feeding rituals.

The creepy-crawlers – which had some closing their windows – group together into colonies of up to 500, craft a massive communal web that appears to float, creating what looks like spiders falling from the sky.

This freaky occurrence naturally happens after hot, muggy weather.

Despite causing quite the scare, experts stress these spiders are harmless to humans—instead, they’re actually quite helpful at keeping pesky insects at bay and promoting ecological diversity.

A video of the incredible event made waves online when environmental enthusiast Bruna Naomi posted it, leading to widespread disbelief and horror.

Chatting with g1, Bruna explained: “I was driving and we stopped the car to record it. It wasn’t the first time. Before this, they’ve stayed hidden in trees and their webs go unnoticed.”

She added with awe, “Every year at this time they appear, and for us it’s always a joy to see them. What impressed us most this year was how far they cast their webs from one tree to another. It’s very far and we were puzzled about how they managed to do it.”

Ominous yet intriguing, the sudden appearance of vast spider webs stirred a chaotic blend of horror and amusement among locals.

Some folks wanted these eight-legged architects gone, while others joked about the critters serving as pest control, with one person noting: “There won’t be any mosquitoes left to bite us with so many spiders.”

Expert Claudio Mauricio Vieira from the Vital Brazil Institute enlightened the public about these mega webs, explaining: “Some species of spiders build these giant webs, which can be used collectively throughout the year or during specific periods. This behavior is a strategy to capture large amounts of food or facilitate reproduction.”

Professor Rodrigo Lopes Ferreira from the Federal University of Lavras delved deeper into the lives of these communal spiders.

He revealed that they gather mainly in their breeding season, from September to March.

“They form a ball of spiders by day, but at night-time, they spread out to spin their webs, creating an illusion as if ‘spider rain’ is falling from the sky,” he remarked in an interview with EPTV.

Moreover, Professor Ferreira reassured concerned citizens, saying although the spiders could nip when mishandled, there’s no reason for alarm as “it doesn’t have potent venom.”

“Of course, if someone handles it carelessly and stresses the creature, they might get bitten, but the venom isn’t a major problem; it’s not among those we consider medically important.”