Invertebrates
Blue Dasher
Pachydiplax longipennis · also called blue dashers
Perched on a reed at the edge of a pond, a male blue dasher angles his wings forward at a sharp, distinctive tilt, a small postural adjustment that helps manage his own body temperature while he watches for both rivals and potential mates.
Overview
The blue dasher, Pachydiplax longipennis, is one of the most common and widespread dragonfly species in North America, native to ponds, lakes, and slow-moving wetland habitat across the continent. Its distinctive forward-angled perching posture and striking powdery blue males make it one of the most frequently observed and easily recognised dragonflies near still water.
A posture doing double duty
The blue dasher’s characteristic wing angle isn’t just a resting position, it’s an active temperature-management tool, letting this small, sun-dependent insect fine-tune its own body heat simply by adjusting how it sits.
Status
Least Concern — widespread and extremely common across suitable wetland habitat throughout North America.
Blue Dasher: common questions
Why does a blue dasher angle its wings forward when perched?
A blue dasher perches with its wings angled forward and down at a distinctive angle, a posture thought to help the dragonfly regulate its body temperature by adjusting how much direct sunlight reaches its body, a useful thermoregulation strategy for an insect that relies on external heat sources.
Why do male and female blue dashers look so different?
A mature male blue dasher develops a powdery pale blue body, quite different from the more yellow-and-black striped pattern retained by females and younger males, a colour difference distinctive enough that the two sexes can look almost like separate species at a glance.
Is the blue dasher easy to find?
Yes, the blue dasher ranks among the most common and widely distributed dragonfly species found across North America, frequently seen perched near ponds, lakes, and slow streams throughout much of the continent.
Where does the blue dasher live?
The blue dasher is native to ponds, lakes, and slow-moving wetland habitat across a broad range of North America, with its larval stage spent entirely underwater before emerging as a flying adult.