Wasps face threats from a surprisingly wide range of animals, fungi, and parasites. Birds, mammals, spiders, frogs, parasitic insects, and even specialized fungi all prey on wasps at various life stages, from solitary foragers to entire underground colonies. The most famous wasp predator in Europe is the honey-buzzard, a raptor that digs up wasp nests and feeds the brood combs to its young. But the full cast of wasp enemies is far more diverse than one unusual hawk, and the strategies these predators use to get past a wasp colony’s painful defenses reveal some remarkable biology.
The Honey-Buzzard, a Raptor Built for Raiding Wasp Nests
The European honey-buzzard (Pernis apivorus) is the only raptor in Europe that specializes in eating the colonies of social wasps. It locates underground wasp nests, digs out the combs with its feet, and feeds on the larvae and pupae inside. When raising chicks, it carries entire comb sections back to the nest for its young.1PubMed Central. The European honey buzzard (Pernis apivorus) as an ally for the control of the invasive yellow‐legged hornet (Vespa velutina nigrithorax) This is not casual opportunism. The bird has anatomical features that look purpose-built for the job: scale-like feathers on its face that resist wasp stings, reinforced nostrils, and long curved claws suited for excavating soil.2Authorea. The trophic strategy of the European honey buzzard Pernis apivorus during breeding: extravagant specialization or genius solution?
The honey-buzzard apparently operates with little concern for the colony’s defensive response. While hundreds of angry wasps swarm around a raided nest, the bird continues excavating, seemingly unaffected.3Annals of the Entomological Society of America. Evolutionary and Ecological Pressures Shaping Social Wasps Collective Defenses This has made it a subject of interest beyond pure ecology. In Europe, the invasive yellow-legged hornet (Vespa velutina) has spread rapidly and threatens honeybee populations. Researchers have found that honey-buzzards quickly incorporated this new hornet into their diet, making it the second most-consumed prey item, which has raised interest in the bird as a potential natural check on the invasion.1PubMed Central. The European honey buzzard (Pernis apivorus) as an ally for the control of the invasive yellow‐legged hornet (Vespa velutina nigrithorax)
Other Birds That Eat Wasps
The honey-buzzard is the standout specialist, but many other bird species eat wasps when the opportunity arises. Bee-eaters, a family of brightly colored insectivorous birds found across Europe, Africa, Asia, and Australia, are especially well known for handling stinging insects. A bee-eater will catch a wasp or bee in flight, then beat the insect against its perch and rub the abdomen to squeeze out the venom sac before swallowing it.4Ibis. The Recognition and Treatment of Venomous and Non‐Venomous Insects by Small Bee‐Eaters This de-venoming behavior is innate, not learned. Even young bee-eaters that have never encountered a wasp perform the correct sequence the first time.
Beyond these specialists, many generalist insectivores eat individual wasps. Starlings, magpies, blackbirds, and various flycatcher species have all been observed taking wasps. These birds tend to pick off solitary foragers rather than attacking nests. The difference matters: a bird snatching a single wasp from a flower faces far less danger than one tearing open a colony of thousands.
Mammals That Dig Up Colonies
Among mammals, the most effective wasp predators belong to a handful of families with the physical equipment to break into nests. A review of predation on social wasp colonies found that carnivores were the most common colony-level predators of wasps in the subfamily Vespinae (which includes yellowjackets and hornets). Badgers and weasels topped the list, followed by bears.3Annals of the Entomological Society of America. Evolutionary and Ecological Pressures Shaping Social Wasps Collective Defenses
What these mammals share is thick fur, tough skin, and powerful digging ability. Badgers have dense pelts and strong forelimbs that let them excavate an underground yellowjacket nest in minutes. Bears, with their massive paws and thick hide, treat wasp and bee nests as high-calorie snack sources and seem largely indifferent to stings. Skunks are another well-known wasp predator in North America. They scratch at the entrance of ground-nesting wasp colonies at night, picking off workers that emerge to investigate the disturbance.
These mammals tend to go after ground-nesting species. Aerial nests hanging from tree branches or building eaves are usually out of reach, which is one reason nest location matters so much in the survival equation for social wasp colonies.
Frogs With a Remarkable Tolerance for Stings
Amphibians are not the first animals that come to mind when you think about wasp predators, but research on Japanese pond frogs has revealed something striking. In laboratory experiments, pond frogs were presented with stinging worker hornets from three species, including the giant Asian hornet (Vespa mandarinia), whose sting is notoriously painful and can be dangerous even to large mammals. Almost all the frogs attacked the hornets. The hornets stung the frogs during these encounters, yet the vast majority of frogs consumed their prey anyway. Consumption rates ranged from about 79% for the giant hornet up to 93% for a smaller hornet species. The stings neither killed nor visibly harmed the frogs.5Ecosphere. Pond frog as a predator of hornet workers: High tolerance to venomous stings
This suggests that at least some frog species have a high natural tolerance for wasp and hornet venom. The mechanism behind this tolerance is not fully understood, but it may involve differences in frog skin composition or immune responses that neutralize the venom components. Frogs are ambush predators that sit and wait near flowers, water sources, or other spots where wasps forage, picking them off with a quick tongue strike. They are unlikely to threaten an entire colony, but they can be meaningful predators of individual workers.
Spiders and Other Invertebrate Predators
Wasps face danger from fellow arthropods as well. Orb-weaving spiders capture wasps in their webs with some regularity. Research on the decorated orb spider Argiope keyserlingi found that vespid wasps were caught more frequently in webs that bore silk decorations than in undecorated webs.6Biological Journal of the Linnean Society. Why cross the web: decoration spectral properties and prey capture in an orb spider (Argiope keyserlingi) web Once a wasp hits a web, the sticky silk and the spider’s rapid wrapping behavior can neutralize the wasp before it can sting effectively. Large orb-weavers and garden spiders are strong enough to subdue yellowjackets and similar medium-sized wasps.
Dragonflies are also capable wasp predators. They are agile aerial hunters that catch prey on the wing, and wasps fall within the size range they can handle. Praying mantises take wasps as well, seizing them with their raptorial forelegs. Robber flies, a family of predatory flies, are aggressive enough to ambush wasps in midair, injecting them with a paralyzing saliva before feeding. None of these invertebrate predators target wasp colonies; they are all solitary-forager hunters that take individual wasps they happen to encounter.
Parasites That Attack Wasps From Within
Some of the most fascinating enemies of wasps are not predators in the traditional sense but parasites that infiltrate colonies and exploit them from the inside. Two groups stand out: parasitoid flies and a bizarre order of insects called Strepsiptera.
Hoverflies in the genus Volucella are large, wasp-mimicking flies whose larvae live inside wasp nests. The adult flies enter wasp colonies and lay their eggs. The larvae then feed on developing wasp larvae, acting as parasitoids. Researchers investigating natural enemies of invasive Vespula wasps found Volucella inanis and Volucella zonaria inhabiting nests, and recent biocontrol strategies have explored using these flies against invasive wasp populations.7Journal of Pest Science. Nest visitors of Vespula wasps and their potential use for biological control in an invaded range How the adult flies manage to enter a colony full of stinging defenders is still debated, but their wasp-like appearance may help them avoid immediate attack.
Strepsipterans, sometimes called twisted-wing parasites, are even stranger. The species Xenos vesparum parasitizes paper wasps. A female strepsipteran lives embedded in the wasp’s abdomen, protruding only slightly between segments. Research has shown that wasp workers infected by a female strepsipteran undergo a dramatic change: instead of dying at the end of summer like uninfected workers, they accumulate extra fat stores and survive through the winter, mimicking the lifespan of a queen. This overwinter survival benefits the parasite by keeping its host alive long enough to transmit infective stages the following spring.8PubMed Central. A Strepsipteran parasite extends the lifespan of workers in a social wasp Workers infected by a male strepsipteran, by contrast, die during the summer on a normal schedule. The parasite is essentially hijacking the wasp’s biology to serve its own reproductive timeline.
Fungal Pathogens That Infect Wasps
Wasps are also vulnerable to entomopathogenic fungi, a group of fungi that specialize in infecting and killing insects. These fungi produce spores that land on a wasp’s exoskeleton, germinate, and penetrate through the cuticle into the body. Once inside, the fungus proliferates through the wasp’s tissues, eventually killing the host. In many cases, the fungus then sporulates from the dead wasp’s body, releasing new spores to infect others nearby.
Researchers studying invasive paper wasps (Polistes chinensis) in New Zealand identified two species of fungi infecting wasp colonies. Molecular analysis confirmed one as Beauveria malawiensis, a member of the Beauveria genus that includes some of the most widely studied insect-killing fungi on the planet.9PubMed Central. Identity, Prevalence, and Pathogenicity of Entomopathogenic Fungi Infecting Invasive Polistes (Vespidae: Polistinae) Paper Wasps in New Zealand Beauveria species are already used commercially as biopesticides against various crop pests, which has led to interest in whether they could be deployed specifically against invasive wasps. The challenge is delivering fungal spores in a way that targets wasp colonies without wiping out beneficial insects.
How Wasps Fight Back
The diversity of wasp predators makes more sense when you consider the other side of the equation: the formidable defensive toolkit that wasps have evolved. Social wasps do not rely on their sting alone. Their defenses are layered, and the most successful predators are those that have found ways around multiple layers at once.
The first line of defense is the nest itself. Some tropical wasp species build nests from a carton material so dense and tough that it resists chewing by ants and may even withstand attacks by birds and monkeys. Species like Chartergus artifex narrow the internal passageways of their nests to the width of a single brood cell, allowing one guard wasp to block an entire corridor against invading ants. Other species have independently evolved the use of mud instead of paper pulp, producing nests that are essentially fortresses. Workers of Polybia emaciata, for instance, retreat inside their mud nest when disturbed rather than swarming out, apparently confident in the structure’s ability to repel attackers.3Annals of the Entomological Society of America. Evolutionary and Ecological Pressures Shaping Social Wasps Collective Defenses
Even within the nest, individual brood cells can be fortified. Some paper wasp foundresses build defensive pulp caps over pupal cocoons, and larger caps discourage would-be raiders. In at least one species, the probability of a pupa being attacked by intruders from other nests dropped as the size of these protective pulp structures increased.10Ethology. Construction of Nest Defensive Structure According to Offspring Value and Its Effect on Predator’s Attack Decision in Paper Wasps
When physical barriers fail, chemical communication takes over. Social wasps use alarm pheromones released from their venom to coordinate defensive responses. Research on the paper wasp Polistes gallicus showed that venom volatiles increase the number of nestmates that join a defensive attack, amplifying the colony’s sting response against a threat.11Journal of Insect Behavior. Nesting Habit and Alarm Pheromones in Polistes gallicus (Hymenoptera, Vespidae) This chemical signaling means that a predator attacking a colony does not face a fixed number of defenders. The attack escalates as more and more workers are recruited by alarm compounds. A single sting becomes a swarm.
The Evolutionary Arms Race
The interplay between wasp defenses and predator adaptations has the hallmarks of a classic evolutionary arms race. Wasps evolved stings and venom. Predators evolved thick fur, scale-like feathers, or physiological tolerance to venom. Wasps evolved coordinated mass attacks triggered by alarm pheromones. Predators evolved speed (birds snatching and flying away), armor (the honey-buzzard’s facial scales), or nighttime raiding strategies (skunks scratching at nest entrances in the dark, when wasps are less active).
The co-evolutionary logic has an interesting asymmetry depending on predator size. Some predators have evolved enough tolerance to survive a sting from a single wasp, but wasps counter this with coordinated colony defense. In this view, the mass attack behavior of social wasps is itself an evolutionary response to individual venom tolerance in predators. A single sting cannot stop a badger. Hundreds of stings, triggered by pheromone-driven escalation, might make the badger reconsider.3Annals of the Entomological Society of America. Evolutionary and Ecological Pressures Shaping Social Wasps Collective Defenses
Smaller predators face a different calculus. A frog eating a single foraging wasp barely registers as a threat to the colony, so the mass defense response is never triggered. The frog wins the encounter because it only needs to tolerate one sting. But a frog could never attack an entire nest; it would be overwhelmed instantly. The predator’s strategy and the wasp defense it encounters are tightly linked to scale.
Why Invasive Wasps Have Fewer Enemies
One practical reason wasp predators matter is that when wasp species are introduced to new regions, they often leave their natural enemies behind. Yellowjackets native to Europe have become serious invasive pests in New Zealand, Australia, and parts of South America. In their home range, populations are kept partly in check by honey-buzzards, parasitoid flies, strepsipteran parasites, and fungal pathogens. In the invaded range, most of these enemies are absent.
This enemy-release effect helps explain why invasive wasp populations can reach densities far higher than anything seen in their native habitat. It has also motivated researchers to look at natural enemies as potential biocontrol agents. The parasitoid hoverfly Volucella inanis has been specifically investigated as a candidate for release against invasive Vespula wasps.7Journal of Pest Science. Nest visitors of Vespula wasps and their potential use for biological control in an invaded range Similarly, entomopathogenic fungi found infecting wasp colonies in invaded regions could eventually be developed into targeted biopesticides.9PubMed Central. Identity, Prevalence, and Pathogenicity of Entomopathogenic Fungi Infecting Invasive Polistes (Vespidae: Polistinae) Paper Wasps in New Zealand
The challenge in biocontrol is specificity. Releasing a generalist predator or a broad-spectrum fungal pathogen could harm native wasp species and other beneficial insects. The most promising approaches aim to exploit the natural enemies that already show some host specificity, whether those are parasitoid flies that prefer to enter Vespula nests or fungal strains that disproportionately infect the target species. Getting this balance right is an active area of research, and no silver-bullet biocontrol agent for invasive wasps has emerged yet.