Top contenders for the planet’s most painful stings include bullet ants, warrior wasps, and the tiny Irukandji jellyfish. Some researchers even made careers out of volunteering to be bitten and stung to find out which creature delivers the worst pain. The BBC asked a few of those daredevils to describe the most painful bites and stings in the animal kingdom and what they went through.
Stinging insects that pack a real punch
Justin Schmidt (1947–2023), an entomologist from Arizona, founded the modern approach to studying insect stings. He created a pain index by subjecting himself to stings from 96 species of insects, including bees, hornets, wasps, and ants. Schmidt sorted those stings into four pain levels and added rather poetic descriptions of how each one felt.
At level one is the hairy flower bee Anthophora. Schmidt described its sting as “almost pleasant, like a lover who nips your earlobe a little too hard.” Level two includes tougher characters, such as the paper wasp; that sting “feels like a burn.” The black wasp Polistes, by contrast, hurts like it’s performing “a satanic ritual.” Schmidt compared that sting to “lighting a gas lamp in an old church and having it explode in your face.”
Black wasp
Seven species in Schmidt’s level three inflicted genuine torture. For example, the velvet ant Klug stung him in a way he compared to “hot oil from a deep fryer pouring over my whole arm.”
Three species earned the right to climb to level four. The first is the bullet ant, also called the “24‑hour ant” for how long the agony from its sting can last. That sting feels “like walking on hot coals with a three‑inch nail embedded in your heel.” The second is the tarantula hawk: a five‑centimeter wasp that hunts tarantulas and stings “like someone tossed a running hair dryer into your bathtub.” And finally, the warrior wasp, whose torture he likened to “being chained in the flow of an erupting volcano.”
After Schmidt died of complications from Parkinson’s disease, American blogger Coyote Peterson picked up the baton and continued testing stings. Peterson exposed himself to about 30 additional species that Schmidt hadn’t included.
After trying those extra stings, Peterson added two more insects to level four: the Japanese giant hornet (the so‑called “murder hornet”) and the kata wasp.
Japanese giant hornet
“The strike from the Japanese giant was undoubtedly the hardest — like being hit in the face by Mike Tyson. I passed out,” the blogger recalled.
But Peterson thinks the kata wasp deserves the crown. Its pain lasted about 12 hours, and the sting caused tissue damage and poisoning.
“Necrotic tissue broke down, forming pockmarks and pits on my forearm. It’s the only sting that physically ate away at flesh, and I still have a scar that looks like a cigarette burn,” Peterson told the BBC.
Jelly creatures that sting worse than they look
In the animal kingdom, insects aren’t the only ones that sting. Jellyfish have tiny harpoon‑like cells called nematocysts that inject venom into a target. The Irukandji jellyfish, with its tiny bell and meter‑long tentacles, inflicts what could be called medieval torture. Scientists know of about 16 species of Irukandji.
Most people don’t even notice they’ve been stung at first, explains Lisa‑Ann Gershwin, a jellyfish researcher at James Cook University in Australia. Symptoms usually start to show about 20 minutes after the sting. The first signs are extreme fatigue or malaise. Then it feels as if someone is pounding your kidneys with a jackhammer; that pain can last up to 12 hours. After that, the person endures profuse sweating that soaks sheets several times an hour, accompanied by relentless vomiting that can continue for a day.
Irukandji jellyfish
Gershwin says that’s only the warm‑up before full‑blown Irukandji syndrome. Then the person experiences “wave after wave of pure agony,” with convulsions and muscle spasms throughout the body and escalating pain. Patients reportedly beg doctors to kill them because they become convinced they are dying and want the suffering to end quickly.
Despite that overwhelming sense of impending death, most people who suffer an Irukandji sting fully recover. Treatment focuses on strong pain relief.
Irukandji isn’t the only jelly that stings terribly. The Australian box jellyfish is considered the world’s most deadly jellyfish. Its tentacles, which can reach about three meters long, leave long whip‑like welts on victims. The marks look “like lash marks, as if you’d been attacked by a nine‑tailed snake,” Gershwin says.
The marine fireworm — which resembles a centipede — defends itself with burning bristles. Those tiny barbed hairs break off and embed in anyone who touches the animal. The hairs contain venom that causes prolonged, intense, burning pain.
Stonefish
Another painful marine resident is the stonefish, which camouflages itself as a rock on sandy shallows, coral reefs, and tidal pools. Beachgoers who step on its sharp spines receive a large dose of blue‑colored venom. The burning pain can last up to 48 hours and is accompanied by swelling.
Researchers generally agree that the Irukandji jellyfish tops the list of the most painful stings. Beyond the agony described above, some Irukandji species can also cause brain hemorrhage and heart failure.
