Common Green Darner (Anax junius) lives in freshwater lakes across North America and Panama. It feeds on mosquitoes and flies. Its conservation status is Least Concern.
Fascinating facts about the Common Green Darner
- Micro-radio tags have shown that a green darner can cover up to 140 kilometres in a single day, although most days it travels a shorter distance. This capacity for long daily flights underpins the species' massive seasonal movements across North America. Researchers also recorded an average groundspeed of about 16 kilometres per hour when tracking individuals in the Great Lakes region, confirming they are strong, fast fliers capable of sustained travel.
- Stable-isotope analysis of specimens collected from Ontario down to Mexico revealed that more than 90 percent of green darners head south in the autumn. The average journey measured about 900 kilometres, linking northern breeding populations with wintering grounds far to the south. This predominant southward movement explains why the fall migration is more conspicuous than the spring return, as the insects traverse a continent-wide corridor each year.
- Female green darners lay their eggs while still coupled to the male, a tandem oviposition that is unique among North American darners. The pair deposits eggs into aquatic vegetation, where the eggs sink beneath the water surface to develop. This coordinated behaviour ensures that the eggs are placed in suitable watery habitats, giving the emerging nymphs immediate access to the aquatic prey they will later hunt.
- A black bulls-eye spot on the frons, right between the eyes, is the signature field mark of the green darner. Both male and female individuals bear this dark circle, making it easy to spot in the field. That same mark is used by experts to tell the species apart from the look-alike comet darner, which lacks the spot. The clear visual cue helps observers confirm identification without needing to examine wing colour or abdomen pattern.
Sources
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At a glance
RangeNorth America and Panama
HabitatFreshwater lakes
DietMosquitoes and flies
About the Common Green Darner
As the Common Green Darner takes to the skies, its iridescent body glimmers like a shard of emerald, slicing through the air with a rhythmic beat of its powerful wings, a mesmerizing dance of predator and prey. With a nomadic spirit, this dragonfly migrates thousands of miles each year, tracing the contours of the continent in a ancient, instinctual journey. Its remarkable endurance and agility make it a formidable hunter, swooping and diving with precision to snatch unsuspecting insects from the air.
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