Praying mantises face threats from a surprisingly wide range of predators, from birds and bats to parasitic wasps and even their own mates. Despite their reputation as fearsome hunters, mantises sit squarely in the middle of the food chain, and their survival depends on an arsenal of defenses that have been shaped by millions of years of predation pressure. The identity of the predator often depends on whether the mantis is flying at night, sitting on a branch during the day, or still developing inside its egg case.
Birds Are the Primary Daytime Threat
Birds are among the most consistent predators of adult praying mantises worldwide. Shrikes, owls, cuckoo-shrikes, and many other species regularly eat mantises when the opportunity arises. A review of bird-mantis interactions found that researchers detected mantis remains in the regurgitated pellets of several bird species across multiple continents. In Algeria, for example, 46 large mantises were found in the pellets of Tawny Owls, with the majority belonging to the species Sphodromantis viridis. In France, a praying mantis weighing about 3 grams was identified in the pellet of an Iberian Grey Shrike. In Australia, a Black-faced Cuckoo-shrike was repeatedly observed catching and eating a large mantid species.1The Wilson Journal of Ornithology. Bird Predation By Praying Mantises: A Global Perspective – Section: DISCUSSION
The relationship between birds and mantises runs both ways. Large mantis species have been documented catching hummingbirds and small songbirds at feeders. But for the vast majority of mantis species, birds are a predator to be avoided, not a meal to be pursued. Most mantises are too small to take on a bird and instead rely on camouflage and sudden defensive displays to survive an encounter.
Research on Ghanaian mantis species found that startle displays, where a mantis suddenly flashes bright wing colors and rears up to look larger, probably function as a bluff that provides some protection from birds.2Zoological Journal of the Linnean Society. Defensive behaviour in Ghanaian praying mantids The display does not indicate the mantis is dangerous or unpalatable. It simply startles the bird long enough for the mantis to escape. Whether the bluff works depends on the bird. A naive predator encountering its first mantis startle display might hesitate; an experienced shrike will not.
Bats and the Single-Ear Defense
After dark, bats replace birds as the dominant aerial threat. Many mantis species fly at night, especially males searching for mates, and echolocating bats are well equipped to detect them in flight. The evolutionary arms race between bats and mantises has produced one of the more unusual sensory systems in the insect world: a single ear located on the underside of the thorax, right between the hind legs.
This ear does not work like the paired ears of most animals. It cannot determine the direction a sound is coming from. What it can do is detect ultrasonic frequencies ranging from about 25 kHz to over 100 kHz, depending on the species, which covers the echolocation calls of most insectivorous bats. When a flying mantis picks up bat-like ultrasound, a pair of specialized nerve cells rapidly carries the signal to the brain in under 20 milliseconds, triggering evasive maneuvers. These can include sharp dives, spirals, and power-dives toward the ground.3The Journal of the Acoustical Society of America. Neuroethology of audition and bat evasion in praying mantises
Researchers have recorded the activity of these nerve cells in mantises while they were actually being attacked by flying, echolocating bats. The neurons responded strongly to the bats’ cries and faithfully tracked the temporal pattern of echolocation pulses during the early stages of the attack.3The Journal of the Acoustical Society of America. Neuroethology of audition and bat evasion in praying mantises The system is far from perfect. If the bat gets close enough before the mantis responds, or if the mantis is too close to the ground to execute a dive, it gets caught. But the ear gives flying mantises a meaningful edge against a predator that would otherwise be nearly impossible to detect at night.
Not all mantises have this ear. Some species, particularly those that are flightless or rarely fly, have reduced or absent hearing. Species that spend their entire lives on vegetation and never take to the air have less reason to invest in bat detection, since bats primarily pose a threat to mantises in open flight.
Parasites That Attack From the Inside
Some of the most consequential enemies of praying mantises are not predators in the traditional sense. They are parasites that exploit the mantis’s body or reproductive investment without necessarily killing it outright, though the end result is often the same.
Wasps That Target Egg Cases
Mantis egg cases, called oothecae, are hardened foam structures that can contain dozens to hundreds of eggs. They are designed to protect developing embryos from weather and casual predators. But specialized parasitic wasps in the genus Podagrion have evolved to penetrate these defenses. Female wasps insert their eggs directly into the ootheca, and the wasp larvae develop by consuming the mantis eggs from the inside. Research on the species Stagmomantis limbata documented spatial patterns of parasitism by torymid wasps, showing that egg case parasitism is a regular and widespread phenomenon rather than a rare event.4Population Ecology. Contrasting scales of oviposition and parasitism in praying mantids
The wasp-mantis interaction is particularly striking because the mantis mother has no way to defend her eggs after laying them. The ootheca’s hardened shell is the only barrier, and Podagrion wasps have ovipositors specifically adapted to drill through it. In some populations, a significant fraction of egg cases show signs of wasp parasitism, which can reduce the number of nymphs that emerge in spring.
Hairworms That Hijack Behavior
Horsehair worms, or hairworms, are internal parasites that mantises acquire by eating infected prey. The worm develops inside the mantis’s body cavity over weeks or months, eventually growing to a length that can exceed the mantis itself. When the worm is ready to reproduce, it needs to reach water, and it manipulates the mantis’s behavior to get there, often driving the host toward streams or ponds where the mantis drowns and the worm emerges.
The behavioral manipulation extends to mating. Research on parasitized male mantises found that infected males actively avoided mating behaviors. They bent their abdomens away from females less frequently and less rapidly, escaped from females more often and more quickly, and mounted females less frequently than healthy males.5Behavioral Ecology. Sex-specific manipulation of sexually cannibalistic mantid mating behavior by hairworms This makes evolutionary sense from the worm’s perspective: if the male mates and gets cannibalized by the female, the worm dies inside her gut before it can reach water. By suppressing mating behavior, the worm keeps its host alive and mobile long enough to complete its own life cycle.
Sexual Cannibalism as a Source of Mortality
One of the most famous threats to a praying mantis comes from its own species. Sexual cannibalism, where the female eats the male during or after mating, is not a laboratory curiosity or an artifact of stressed captive conditions. Field observations of Mantis religiosa recorded sexual cannibalism in roughly 31% of matings observed in the wild.6Animal Behaviour. Sexual cannibalism in the praying mantid, Mantis religiosa: a field study That means nearly one in three mating attempts ends with the male being consumed.
The dynamics of sexual cannibalism are more nuanced than they first appear. Research on the Chinese mantis (Tenodera sinensis) tested whether males gain any reproductive benefit from being eaten. By feeding males and females differently labeled food, researchers tracked where nutrients ended up after mating. In pairs where cannibalism occurred, components of the male’s body were directly allocated to the eggs he had fertilized.7PubMed Central. Sexual cannibalism increases male material investment in offspring: quantifying terminal reproductive effort in a praying mantis The cannibalized male essentially becomes a food source for his own offspring. This does not mean males willingly submit. Males approach cautiously, often waiting for the female to be distracted by prey before attempting to mount. But it does mean the evolutionary cost of cannibalism is partially offset for males whose genes make it into the next generation.
Rates of sexual cannibalism vary across species and conditions. Hungry females are more likely to attack approaching males. Some species show very low cannibalism rates under natural conditions, while others, particularly large-bodied species with strong sexual size differences, show higher rates. The 31% figure from wild Mantis religiosa gives a useful benchmark, but it would be a mistake to apply it to all 2,400-plus known mantis species.
Reptiles, Amphibians, and Small Mammals
Beyond birds and bats, mantises face predation from a range of other vertebrates. Lizards are frequent predators, particularly species like chameleons and anoles that share the same branches and foliage where mantises hunt. Frogs and toads will take mantises when they encounter them on or near the ground. Smaller insectivorous mammals, including shrews and mice, also eat mantises opportunistically.
For most of these predators, mantises are not a dietary staple but part of a generalist diet. A tree frog does not specifically hunt mantises; it eats whatever appropriately sized insect lands nearby. This means predation from reptiles, amphibians, and small mammals tends to be density-dependent. In habitats where mantises are common, they show up more often in the diets of local generalists. In habitats where they are sparse, they barely register.
Other Arthropods
Mantises are sometimes eaten by other large invertebrates, including spiders, large predatory beetles, and even other mantis species. Orb-weaving spiders occasionally capture small mantises or nymphs in their webs. Larger mantis species are known to prey on smaller ones, so cannibalism outside a mating context happens too, particularly when nymphs from the same egg case emerge together and compete for limited food.
Ants can be a threat to newly hatched mantis nymphs. Mantis nymphs emerging from an ootheca are tiny and soft-bodied, making them vulnerable to raiding ant colonies. Nymphs at this stage scatter rapidly after hatching, and most of the mortality during a mantis’s life likely occurs in the first few days and weeks as nymphs, before they reach a size that deters small predators.
How Mantises Defend Themselves
Given the range of threats they face, mantises have evolved a layered set of defensive strategies. Their primary defense is crypsis, or blending in. Many species are colored and shaped to match leaves, bark, flowers, or dead twigs, and they stay motionless for long periods. A mantis that is never noticed by a predator never needs to fight or flee.
When camouflage fails, mantises deploy secondary defenses. A study of Ghanaian species cataloged a range of these responses, including running, flying, playing dead (thanatosis), secreting fluid from the mouth, and performing startle displays with flash coloration.8Oxford Academic. Defensive behaviour in Ghanaian praying mantids The specific response depends on the species and the threat. A mantis confronted by a bird on a branch might rear up and spread its wings to flash bright colors. A mantis grabbed by a larger predator might go limp and play dead, or regurgitate gut fluid in an attempt to taste unpleasant.
Startle displays are particularly elaborate in some lineages. Research into how these displays evolved across mantis species found that they are complex performances that can include coordinated movements, bright wing patterns, and even sounds. They function by deterring or confusing predators rather than by signaling genuine danger.9PubMed Central. The evolution of startle displays: a case study in praying mantises The displays appear to have evolved independently in multiple mantis lineages, which suggests that predation pressure from visually guided predators, primarily birds and lizards, has been a persistent force shaping mantis evolution.
How Artificial Light Changes the Equation
Mantises are primarily diurnal hunters, meaning their visual system is optimized for daylight. Research on the Asian mantis Hierodula chinensis tested how well mantises could hunt under different light levels and found sharp declines in predation success as light dropped. In complete darkness, there was no evidence that mantises could capture prey at all. Under simulated moonlight, nymphs had about half the predation success compared to complete darkness conditions combined (a 50% improvement over pitch black, but still roughly 46% lower than under dusk-level light). Adults showed a similar pattern.10Oxford Academic (Environmental Entomology). Diurnal predators in dim light: the ability of mantids to prey for supper
This matters for predation risk because a mantis that cannot hunt effectively also cannot afford to sit exposed in dim conditions. Artificial lighting near buildings and streetlights creates patches of brightness at night that attract both insects and their predators. Mantises drawn to these lit areas may gain some foraging ability, but they also become more visible to nocturnal hunters like bats and owls. The net effect of light pollution on mantis survival is not well studied, but the basic trade-off, greater visibility cutting both ways, is easy to see.
Ancient Mantises Faced a Different Predator Landscape
Modern mantises catch prey exclusively with their raptorial front legs, the distinctive “praying” limbs that give the group its name. But the oldest known mantises lived in a world before flowering plants attracted dense insect communities, and their hunting toolkit looked different. An exceptionally preserved 110-million-year-old specimen of Santanmantis axelrodi from the Crato Formation in Brazil revealed that early mantises used at least two pairs of legs for catching prey. The second pair of thoracic legs bore numerous strong, sharp-tipped spines resembling the raptorial spines on the front legs.11PeerJ. An exceptionally preserved 110 million years old praying mantis provides new insights into the predatory behaviour of early mantodeans
This tells us that early mantises were likely both hunting and being hunted differently than their modern descendants. During the Cretaceous period, the dominant aerial predators were not birds as we know them but pterosaurs, early avians, and a variety of predatory insects that are now extinct. The transition to using only the front legs for predation, freeing the other legs for walking and perching, coincided with mantises diversifying into the thousands of species alive today. That diversification produced the wide range of camouflage strategies, body plans, and defensive displays that help modern mantises survive against the predators described above. The predator-prey arms race that shaped mantis evolution is ancient, and the threats mantises face today are just the latest chapter in a story stretching back more than a hundred million years.