Invertebrates
Devil's Flower Mantis
Idolomantis diabolica · also called devil's flower mantis, giant devil's flower mantis, king of mantids
The devil’s flower mantis is one of the largest and most spectacular mantises in the world. For most of the time it sits still and unremarkable, a soft green shape among the leaves of an East African thornbush. But threaten it, and it explodes upward into a monster: wings thrown wide, front legs spread, flashing a hidden burst of red, white, and blue that is pure bluff.
Overview
The devil’s flower mantis lives in the dry bushland and savanna of eastern Africa. It is one of the largest mantis species, with females around 12–13 cm and males smaller and slimmer. The body is pale green to brown, carved with leaf-like lobes and flanges on the limbs and thorax.
The display
Alarmed, it rears back, throws its wings open, and spreads its front legs to reveal vivid patches of red, white, blue-purple, and black that are hidden when it is calm. The sudden change in size and colour can make a bird or lizard hesitate long enough for the mantis to escape. The “devil” in its name is about this look, not about any real danger — the mantis has no venom and cannot hurt a person.
A flower in disguise
At rest, its colour, shape, and lobed limbs suggest a flower or a cluster of petals. This hides it from predators and, at the same time, lures nectar-seeking moths, butterflies, and bees within reach of its spined front legs.
Status
The devil’s flower mantis has not been formally assessed. It occurs across a wide belt of eastern Africa and is collected for the exotic pet trade, where it is considered an advanced species to keep, though captive breeding now supplies much of the demand.
Devil's Flower Mantis: common questions
Why is it called the devil's flower mantis?
The name comes from its defensive display rather than from any real danger. When the mantis feels threatened it snaps into a deimatic, or startle, posture, rocking backward and flinging open its wings and forelegs to expose bright warning colours that are hidden when it is calm. The sudden change in size and the flash of red, white, and blue-black make the insect look briefly like a much larger, more dangerous animal, which can startle a predator into backing off or give the mantis a moment to escape. Early naturalists thought the transformed shape looked demonic, and the name stuck.
Is the devil's flower mantis dangerous to humans?
Not at all. It has no venom, its bite is too weak to break skin meaningfully, and the spines on its front legs are for gripping insect prey. The entire threat display is a bluff aimed at birds, lizards, and small mammals. Handled gently it may strike a defensive pose or give a harmless nip, but it cannot injure a person. The only practical caution is that it is a delicate insect and rough handling can hurt the mantis.
How does the flower mimicry work?
The mantis combines colour, shape, and stillness. Its body is a soft green or brown, and its legs and thorax carry leaf-like flaps and lobes that break up the hard outline an insect eye would recognise. Sitting motionless on or near vegetation, it reads as part of a plant or a bloom rather than as an animal. This hides it from the birds and lizards that would eat it, and at the same time it can draw in nectar- and pollen-seeking insects that mistake the mantis for a flower, bringing prey to within reach of its strike.
How big does the devil's flower mantis get, and is it really the largest mantis?
Females reach about 12 to 13 centimetres and are among the largest mantises in the world, which is why the species is nicknamed the king of mantids. Whether it is strictly the largest depends on how size is measured, since a few other mantises, such as certain Asian giant and stick mantises, can be longer and heavier-bodied. What is not disputed is that Idolomantis diabolica is a very large mantis with an unusually elaborate body form and the most theatrical threat display of any of them.