Invertebrates
Common Green Darner
Anax junius · also called green darner
A common green darner departs a northern pond each autumn on a journey it will never complete alone, its eventual return the following spring accomplished instead by grandchildren it will never meet, born and raised somewhere along the very route it first travelled south.
Overview
The common green darner, Anax junius, is one of the largest and fastest dragonfly species in North America, native to ponds, lakes, and wetland habitat across a broad range of North and Central America. Its remarkable multi-generational migration cycle and exceptional aerial agility make it one of the more behaviourally and physically impressive insects found anywhere on the continent.
A journey no single generation completes
Unlike birds that make their own round-trip migration, the common green darner passes the baton across generations entirely, meaning the individual that eventually returns north each spring shares nothing but ancestry with the one that first flew south the previous fall.
Status
Least Concern — widespread and abundant across suitable wetland habitat throughout North and Central America.
Common Green Darner: common questions
How does the common green darner's migration work across generations?
A common green darner undertakes a genuine multi-generational migration cycle, with individuals flying south in autumn, a subsequent generation hatching and breeding along the migration route, and the descendants of the original southbound migrants eventually completing the return journey north the following spring, meaning no single individual makes the full round trip.
How fast can a common green darner fly?
The common green darner ranks among the largest and fastest-flying dragonfly species in North America, capable of rapid, highly manoeuvrable flight that lets it capture flying insect prey and evade predators with considerable agility.
How does the common green darner see so well?
A common green darner has exceptionally large compound eyes that wrap around most of its head, providing nearly complete visual coverage that helps it spot both prey and approaching threats from almost any direction.
Where does the common green darner live?
The common green darner is native to ponds, lakes, and slow-moving wetland habitat across a broad range of North and Central America, with its larval stage spent entirely underwater before emerging as a flying adult.