Identification
The Emperor is a true titan of the sky, reaching up to 80mm in length. Look for the male’s brilliant, sky-blue abdomen marked by a continuous black dorsal stripe—resembling a dark zipper running down its spine. Its thorax is a solid, vibrant apple-green, a key field mark that distinguishes it from the Southern Hawker, which features striped "shoulder" markings. Females are generally a camouflaged green, though some "andromorph" individuals can sport male-like blue. Both sexes possess a distinctive black "pentagon" mark on the forehead (frons), visible through binoculars.
Habitat & Range
Widespread across Europe, Africa, and Central Asia, the Emperor thrives near still or slow-moving waters. You will find them patrolling the margins of large ponds, lakes, and canals, particularly where lush emergent vegetation like reeds and bulrushes provides cover. They are highly adaptable and are often the first large dragonflies to colonize newly dug garden ponds.
Behaviour
Observers will immediately notice the male’s relentless territoriality. He is a "hawker" that rarely perches, instead spending hours on the wing, patrolling his beat with a powerful, purposeful flight. If he does rest, he hangs vertically from tall vegetation rather than sitting flat. Watch for the male aggressively intercepting any rival that enters his airspace. Females are more elusive, appearing at the water’s edge primarily to oviposit (lay eggs) directly into floating plant tissue.
Diet
An apex aerial predator, the Emperor hunts mid-air, using its legs like a basket to snatch flies, butterflies, and even smaller dragonflies. Its powerful mandibles can masticate prey while still in flight. Below the surface, the "prolarvae" are equally fearsome, stalking tadpoles and small fish with a hinged lower lip.
Fascinating Fact
The Emperor is a master of thermoregulation. On cool mornings, it can "shiver" its wing muscles to generate internal heat, allowing it to take flight and hunt long before its competitors have even warmed up!