Are Hornets Really Dangerous?

A stubborn myth

Hardly any insect carries a reputation as exaggerated as the hornet’s. The saying «three stings kill a human, seven kill a horse» has been passed down for generations, yet it is simply untrue. The amount of venom a hornet delivers with a single sting does differ slightly from a wasp’s in composition and quantity, but it lies far below a dose that would be lethal to a healthy person. Studies and specialist bodies confirm it too: there is no reliable evidence that some specific low number of stings is fatal in itself.

Why the sting still feels fiercer

The fact that hornet stings are often perceived as particularly painful does have a real basis: their venom contains, among other substances, what is known as hornet kinin, an agent that irritates pain receptors more strongly. That sharper pain is frequently mistaken for greater danger — yet the actual effect of the venom is comparable to that of a wasp. Hornets are also noticeably larger than most native wasp species, which lends them a more menacing impression on the strength of their build alone, without this equating to any real danger.

When caution really is warranted

Genuine caution is called for above all with a known insect venom allergy, in which even a single sting — from a hornet or a wasp — can trigger a severe allergic reaction. Stings in the mouth or throat, for instance after drinking from an open can, are likewise to be taken particularly seriously regardless of the species, as swelling there can constrict the airways. Outside these cases a hornet sting is painful, but not a medical emergency. How hornets and wasps differ in appearance is set out in the guide Hornisse oder Wespe, and which natural enemies both groups of species have is covered in the article on the natural enemies of the wasp. Our pillar guide wasps: the key facts at a glance offers an overview of the topic, while the species overview helps with identifying species.