Why Do Bees Die After Stinging? Only 8 Species Do

On 4 August 2014, a mechanical engineer named Jianing Wu published the results of an experiment he had run on about thirty honey bee stings. Working in the tribology lab of Tsinghua University’s mechanical engineering department, Wu and three colleagues fixed each sting upright on a droplet of adhesive and drove it, at six millimetres per second, into small cubes of agar, silica gel, soft rubber and paraffin wax.

The stings went in. They also turned. Each one carries two rows of about ten barbs, and those rows wrap the shaft as a right-handed helix set at 8 to 9 degrees, so the whole thing rotates clockwise on the way in. The average measured rotation was about eight degrees, matching the helix almost exactly. A honey bee’s sting behaves less like a needle and more like a screw that drives itself.

Which is why she cannot get it back out of your arm, and why she can get it back out of a beetle.

Why do bees die after stinging?

A worker honey bee dies after stinging a mammal because the sting is barbed and lodges in elastic skin, so the bee tears free without it and leaves the end of her own abdomen behind. That injury is fatal. Honey bees that sting other insects can withdraw the sting from the hard cuticle and fly off intact.

Eight species out of almost 21,000

James Dorey, Amy-Marie Gilpin and Rosalyn Gloag laid out the arithmetic in The Conversation in April 2024: “Only eight out of almost 21,000 bee species in the world die when they sting.” Those eight are the honey bees, genus Apis. For 99.96% of bee species, dying is not what stinging does.

The rest of the roll call is odder than the headline. 537 species, about 2.6% of all bees, are the stingless bees of the tribe Meliponini. Hundreds of other species have given up stinging entirely, and the vast majority of bees are solitary rather than social, so most of the world’s bees have no colony to die for in the first place.

Bee	Can it sting you?	Does it die?
Worker honey bee, the 8 Apis species	Yes	Yes, the sting stays in you
Every other bee species, 99.96% of them	Many can	No
Stingless bees, 537 Meliponini species	No	Not applicable
Any male bee, any species	No	Not applicable

The barb only bites into skin that stretches

The sting is a stylet flanked by two barbed lancets that walk themselves into a wound, one side catching while the other slides forward. Reviewing sting morphology across the social wasps in the journal Insects in 2021, Bissessarsingh and Starr describe what heavy barbing buys: it “increases the likelihood of the stinger remaining fatally embedded in the skin of a vertebrate adversary”. The same review records the exception in a single line, crediting Tautz with the observation that a honey bee can withdraw the stinger after stinging an arthropod.

Whether that makes the barb a weapon aimed at vertebrates or an accident of geometry is not settled. Bissessarsingh and Starr report Tautz’s reading that the bee’s inability to withdraw from a vertebrate may be an evolutionary mistake, while the barbs themselves look like equipment for exactly that fight. Questions carry assumptions, and this one carries a shaky assumption, which puts it in the company of the riddle about the raven and the writing desk.

The sting takes a piece of her abdomen with it

Kirk Visscher and Richard Vetter of UC Riverside, with Scott Camazine, set out the inventory: the detached sting carries away “the entire distal segment of the bee’s abdomen, along with a nerve ganglion, various muscles, a venom sac” and the far end of her digestive tract.

Three of those parts, the ganglion, the muscles and the venom sac, are still on duty in your skin.

The sting keeps working after the bee is gone

The piece left in your skin is a functioning machine. The attached nerve ganglion coordinates the muscles so the stylets move alternately, a valve and piston on the lancets pump venom “like an old-fashioned water pump”, and the barbs give one way traction “so that the sting continues to work itself deeper into the flesh”. The bee is elsewhere. The sting has not finished.

It also marks you. The same page notes an alarm pheromone released at the base of the sting, which “makes other bees more likely to sting, and aids them in locating the victim”. Its principal active component is isopentyl acetate, produced by the Koschevnikov gland and the sting sheaths, according to Bortolotti and Costa in Neurobiology of Chemical Communication. Isopentyl acetate is also sold as banana oil, and the US National Institute for Occupational Safety and Health describes it as a “colorless liquid with a banana-like odor”. The colony she was defending stores a food that never goes off; the flag she leaves on you smells like a different one. Stink bugs raise the alarm with an aldehyde: (E)-2-decenal, a major component of the brown marmorated stink bug’s alarm pheromone, is also one of the compounds behind the soapy note in cilantro.

Losing the sting does not even retire her. Cunard and Breed, writing in the Annals of the Entomological Society of America in 1998, found that “following sting autotomy, honey bee workers continue to participate in colony defense by following and harassing potential predators”.

The suicide reading is a story we added

The popular version says a honey bee sacrifices herself for the hive, and that every bee does the same. Both halves fail. The arithmetic kills the second half outright, and the first is folklore assembled backwards from the outcome, since a mechanism that anchors in one kind of tissue and slides out of another is not an act of will. Insect behaviour invites this sort of over-reading, in much the way a fly wringing its front legs looks like scheming and is really housekeeping.

The scrape-do-not-pinch rule got tested on a real forearm

Visscher and Vetter ran the experiment on their own forearms. They caught workers leaving a hive, held each one by the wings, and “pressed her against the skin of the inside of the subject’s forearm until she stung”, logging five-sting series on both arms of one subject and ten stings per treatment across two.

Scraped stings produced a mean weal of 80 square millimetres, pinched stings 74, a difference their analysis found not significant. Delay was the variable that moved the number: across removals timed at 0.5, 1, 2, 4 and 8 seconds, weal area increased with the time from sting to removal. Their report ran in The Lancet in August 1996, and what it found was about speed rather than technique.

No male bee has ever stung anybody

A sting is a modified ovipositor. Dorey, Gilpin and Gloag put it as “a tube for laying eggs (ovipositor) that has also been adapted for violent defence”, which settles the question of the males: male bees of all species lack stingers, having nothing to convert. Some will bluff the motion anyway if you pick them up.

The honey bee at the end of your arm is not choosing anything. She is driving a right-handed screw into the one material it cannot reverse out of, and the machine keeps running after she has gone. Strictly FYI.