“Dragonflies are prehistoric insects, having flown on Earth since before the dinosaurs!”
Emperor dragonflies patrol ponds, lakes, and slow waterways across Europe and western Asia. Adults intercept insects in flight with independently controlled wings, while aquatic nymphs spend their earlier lives hunting below the surface.
By An Nguyen · Updated
Browse photographs of dragonfly across habitat, behavior, anatomy, and life stages.
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Core article
A closer look at habitat, diet, behavior, reproduction, and conservation.
The Emperor dragonfly (Anax imperator) is a large, iridescent predatory insect whose order predates the first dinosaurs. It is an agile flier, able to hover, fly backward, and make sharp turns at speeds up to 30 mph. Its large compound eyes provide a nearly 360-degree field of vision. As a predator, it consumes large numbers of mosquitoes, midges, and flies in freshwater wetlands.
Scientifically classified as Anax imperator, the Emperor dragonfly belongs to the kingdom Animalia, phylum Arthropoda, and the class Insecta. It is a prominent member of the order Odonata, which encompasses all dragonflies and damselflies, and falls within the family Aeshnidae, known as the "hawkers" or "darners."
Evolutionarily, the Odonata order is extraordinarily ancient. Fossil records reveal that ancestors of modern dragonflies, such as Meganeura, ruled the Carboniferous skies over 300 million years ago, boasting wingspans of over two feet. While modern dragonflies are significantly smaller, they have retained the primitive, highly effective wing structure of their ancestors. Unlike most modern insects, dragonflies cannot fold their wings flat against their abdomens; they remain permanently outstretched, a reflection of their deep prehistoric roots.
The anatomy of the Emperor dragonfly is a fascinating example of biomechanical engineering. Measuring between 7 and 8 cm in length and weighing a mere 1 to 2 grams, the adult features a long, slender abdomen—vibrantly blue in males and green in females—that acts as a counterbalance during high-speed maneuvers.
Their visual system is arguably the most advanced among insects. A dragonfly’s head is almost entirely consumed by two massive compound eyes, each containing up to 30,000 individual hexagonal lenses (ommatidia). This grants them uncompromised, 360-degree vision, allowing them to track the erratic flight paths of multiple prey items simultaneously.
The dragonfly's flight apparatus is unparalleled. They possess two pairs of transparent, heavily veined wings. Crucially, powerful thoracic muscles allow the dragonfly to operate each of its four wings entirely independently. This asymmetrical control enables rapid acceleration, hovering, and abrupt directional changes in a fraction of a second. Furthermore, their legs are set far forward and covered in stiff bristles, designed not for walking, but for forming a deadly "basket" to snatch prey out of the air.
Anax imperator is widely distributed across Europe, Asia, and Africa, with robust populations in the United Kingdom, France, Germany, Japan, China, and South Africa.
Their habitat is intrinsically linked to freshwater ecosystems. They are heavily concentrated around slow-moving rivers, large ponds, marshes, and expansive wetlands. Because they spend the vast majority of their lives underwater as aquatic nymphs, the presence of clean, unpolluted water heavily vegetated with reeds and submerged plants is an absolute biological necessity for their survival and reproduction.
Dragonflies are obligate carnivores and voracious hunters, functioning as a critical natural control against pest insect populations. Their diet consists almost entirely of other flying insects, including mosquitoes, flies, gnats, moths, butterflies, and even smaller species of dragonflies.
The praying mantis is another insect predator, but it usually waits on vegetation rather than intercepting prey over open water.
Their feeding strategy relies on pure aerial interception. Rather than chasing prey from behind, a dragonfly uses its compound eyes to calculate the precise trajectory and speed of its target, flying to an interception point to cut the prey off. This method is lethally effective; researchers calculate that dragonflies successfully capture up to 95% of the prey they target, making them one of the most successful predators on the planet. The prey is snatched mid-air using their bristled legs and often consumed on the wing, crushed by powerful, serrated mandibles.
Dragonflies are highly solitary and aggressively territorial. Male Emperor dragonflies, in particular, spend their short adult lives fiercely patrolling their chosen stretch of water.
They establish territories around breeding sites, usually sections of a pond with abundant aquatic vegetation. A resident male may chase an intruding male through rapid turns and short aerial contact until one leaves the area. Adults are generally solitary outside mating, spending much of their time hunting and defending access to breeding habitat.
The life cycle of the dragonfly is a dramatic process of incomplete metamorphosis. Following a mid-air mating sequence, the female descends to the water's surface, using her ovipositor to inject up to 1,500 eggs directly into the stems of submerged aquatic plants.
After an incubation period of 1 to 3 weeks, the eggs hatch into aquatic nymphs (naiads). These nymphs are ferocious underwater predators, utilizing an extendable, hinged lower jaw to snatch mosquito larvae, tadpoles, and even small fish. The nymph stage is the longest part of a dragonfly's life, lasting anywhere from 1 to 5 years depending on water temperatures. When the nymph reaches maturity, it climbs a reed out of the water under the cover of darkness. In a vulnerable process, the nymph's exoskeleton splits open, and the winged adult extracts itself. The adult dragonfly's lifespan is remarkably brief; once they take to the air, they generally live for only 1 to 2 months.
(Population and conservation trend data sourced from the IUCN Red List of Threatened Species)
The Emperor dragonfly is currently assessed by the IUCN as a species of "Least Concern," largely due to its immense geographic range and adaptability to artificial bodies of water, such as garden ponds and reservoirs.
However, dragonfly populations serve as critical bioindicators for the health of wetland ecosystems. The primary threat they face is the systemic degradation of freshwater habitats through agricultural runoff, pesticide pollution, and the draining of wetlands for urban development. Because their nymphs require clean, oxygen-rich water for several years to develop, heavy chemical pollution in a pond or river can rapidly annihilate an entire local population before they ever reach the adult stage.
Kingdom
Animalia
Phylum
Arthropoda
Class
Insecta
Order
Odonata
Family
Aeshnidae
Genus
Anax
Species
A. imperator
Dragonflies are prehistoric insects, having flown on Earth since before the dinosaurs!
They are incredibly fast and agile fliers, capable of hovering, flying backwards, and even upside down.
A dragonfly has nearly 360-degree vision, with two giant compound eyes containing up to 30,000 lenses each.
They are expert hunters, catching up to 95% of the prey they target in mid-air.
Baby dragonflies, called nymphs, live underwater for up to 5 years before emerging as flying adults.
Dragonflies can move each of their four wings independently, allowing them to make sharp turns in a split second.
Select a question to reveal the answer.
A dragonfly is a large, fast-flying predatory insect known for its long, slender body, two pairs of wings, and giant compound eyes. They are excellent flyers and hunters.
Dragonflies live near freshwater habitats such as ponds, lakes, marshes, and slow-moving streams where they can find plenty of insects to eat.
They are carnivores that eat other flying insects, including mosquitoes, flies, gnats, butterflies, and moths. They catch their food in the air using their legs.
A young dragonfly is called a nymph or naiad. It lives underwater and hunts tiny aquatic animals before becoming a flying adult.
Dragonflies have two pairs of wings that can move independently, letting them hover, turn sharply, and fly backward.
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