Dragonflies: flight begins underwater

When a dragonfly crosses a pond, we see only one part of its story. Its life cycle includes an egg, an aquatic larva and a winged adult, without the pupal stage familiar from butterflies. The British Dragonfly Society calls this incomplete metamorphosis: incomplete describes a classification, not a fault in the animal. The change still produces an adult able to fly; it simply follows a different route from caterpillar and chrysalis. [1]

The larva does not sit still waiting for wings. It lives and hunts in the water. The natural-history sources describe a modified lower lip, the labium, that extends to seize prey. We might picture an articulated pair of grabbers, but that is our editorial comparison, not a tool separate from the animal’s body. The useful contrast is between ways of moving and feeding: first underwater, then in the air, within one life cycle. [2][4]

When the final moult approaches, the larva leaves the water and finds support. Its outer covering opens and the adult emerges; the wings must expand and harden before flight. Our illustration brings together a larva, an abandoned casing on a stem and an adult to explain the sequence. It is not a photograph of three identified individuals, nor does it suggest an instant leap from aquatic life to flight without a vulnerable transition. [1]

That empty casing has a name: an exuvia. The British Dragonfly Society explains that a motionless case on a stem may remain after an adult has emerged, rather than being a larva in trouble. The distinction matters to observers: look without touching before imagining a rescue. The cycle also varies with species and conditions. There is no single number of days that describes the life of every larva or every adult. [3]

Here is an editorial exercise for a walk somewhere accessible and safe. Draw a line between water and air, then add a plant crossing it. Mark where you would look for a larva, an exuvia and an adult without collecting them. The drawing connects things we usually notice separately. You do not need to find all three: even a walk with no sightings can reveal which parts of a habitat you had overlooked. [3]

Watching only the wings can make us forget the water and supporting vegetation. The museum mentions both when explaining suitable dragonfly habitats. That does not make every small pool suitable for every species, or justify moving animals between ponds. The discovery is simpler: a life that seems to belong to the sky also depends on less visible places below the surface and along the edge of the water. [2]