1. Which Bees Die After Stinging, and Which Do Not
According to the Bee Research Facility at the University of California, Riverside, the Western honey bee is characterized by its stinger detaching from its body after a sting, a point that contrasts with other stinging insects [1].
However, not all bees die after stinging. Medical texts state that the stingers of hornets (family Vespidae) lack backward-facing barbs, allowing them to sting repeatedly [2]. Queen bees, bumblebees, and many solitary bees also have smooth stingers with only tiny barbs, which allows them to sting mammals multiple times [3]. It is important to note that some hornets do have small barbs. Rather than saying "only honey bees are special," it is more accurate to view this as a difference in the strength of the barbs [3].
Note: Do not simplify this to "only honey bees die." It is safer to understand this as a difference in the degree of barb strength.
2. How the Backward-Facing Barbs on a Honey Bee's Stinger Work
The tip of a honey bee’s stinger has backward-facing barbs. These barbs ensure that the stinger only experiences pulling force in one direction. The University of California, Riverside explains that after the stinger detaches, it continues to move and can move deeper into the flesh because of these barbs [1]. This is similar to how a cable tie only tightens in one direction. However, unlike a cable tie, the stinger moves further inside by its own force.
The stinger gets stuck in the skin and tears away from the honey bee’s abdomen. The bee then dies within a short time, according to secondary sources [3]. The stinger becomes stuck specifically when the victim is a target like a mammal, whose skin is elastic and thick. If the victim is another insect, the stinger does not get caught, and the bee can sting repeatedly. This condition is based on secondary sources [3].
3. Why a Honey Bee's Detached Stinger Keeps Pumping Venom
The stinger is made of two thin needles combined together. At the base, there is a valve and a piston that push venom out from the venom sac. The University of California, Riverside compares this mechanism to an old-fashioned hand-operated water pump [1]. Even after the stinger leaves the bee’s body, this pump continues to deliver venom [1].
General explanations suggest that parts of the bee’s abdomen tip, a nerve cluster, muscles, the venom sac, and the end of the digestive tract come off with the stinger [6]. However, this is from a general-audience explanation. It is safer to interpret this as "part of the body tip tears off" rather than saying "the internal organs fall out."
Time matters. According to the University of California, Riverside, the longer the stinger remains in the skin, the larger the red swelling becomes. Delays ranging from 0.5 seconds to 8 seconds showed differences in swelling [1]. Experiments report that the speed of removal is more important than the method of removal. This article does not provide instructions on how to remove a stinger. Please check guidelines from medical institutions or public agencies for proper care.
4. Does a Honey Bee's Death Help Defend Its Colony?
Honey bees attack primarily to protect their nest. Japanese explanatory sites state that they sting to defend the hive [5]. However, this source does not clarify the meaning of the individual bee’s death or whether they evolved specifically to sacrifice themselves.
The base of the stinger releases an alarm pheromone. Other honey bees that detect this scent are more likely to sting, according to the University of California, Riverside [1].
5. How a Honey Bee's Stinger Developed from an Egg-Laying Tube
News from Kobe University explains that a bee’s venom stinger is a modified ovipositor (egg-laying tube). Therefore, only females can sting with a venom stinger. However, the same announcement notes that some male potter wasps can sting using spines on their mating organs, though these spines do not contain venom [4].
What is still unknown? These sources do not explain what shape of ovipositor gave rise to the backward-facing barbs. Why the stinger shapes differ between honey bees and hornets is a question worth investigating further.
6. How to Investigate Honey Bee Stingers Further
What you can do today: Compare illustrations of honey bees, hornets, and bumblebees in library encyclopedias. Check how the "difference in barb strength" is represented in actual drawings.
What you can do outside: Observe honey bees visiting flowers from a distance. It is important not to approach the nest or touch the bees.
Official information: For first aid after a sting, consult guidelines from medical institutions or local authorities. This article is not medical advice.