dances in the forest clearing air
- Size
- Length: 5–10 mm
- Lifespan
- 1–2 years
- Diet
- Adults predatory, feeding on small flying insects. Some species have elaborate courtship rituals where males offer captured prey to females wrapped in silk.
- Habitat
- Forest clearings and near water. The ballerinas of the evening air, famous for their complex aerial mating dances.
- Range
- Throughout North and South Islands in forest clearings, near streams and in damp grasslands. Most common in native forest areas and along river margins.
- Endemism
- Native
- Main Threats
- Habitat loss from forest clearance and wetland drainage. Water pollution and pesticide use which affects prey species and breeding habitats.
- Population
- A very large and diverse family in New Zealand. A staple of summer twilight, often seen in swarms above streams or tracks.
- Conservation Status
- Not Threatened
- Human Risk
- harmless
- Handling Note
- native dance fly, aerial predator leave undisturbed
- Conservation Note
- Native fly; not assessed by NZTCS as invertebrates are generally outside the scope of current threat classifications.
- Te Ao Māori
- The Dance Fly has no recorded Māori name. It represents ritualised connection and serves as a symbol of choreographed life. Known as the gift-bearers of the dusk, they occupy a cultural niche as a reminder that the most basic biological drives can be expressed through complex social rituals. Cooperation and the exchange of gifts are ancient strategies for building a future.
The romantic of the riverbank. A fly that gives gifts. The dance fly is a predatory dipteran with slender, elegant anatomy and a behavioural repertoire virtually unique within the insect world. These aerial acrobats are best known for their sophisticated nuptial gifts. A fly that brings presents.
The male captures a small insect such as a midge or gnat. He occasionally wraps it in a delicate, silken balloon produced from specialised glands. This gift-giving behaviour serves as a vital biological signal of the male's hunting prowess. It provides the female with the essential protein required for egg development. A fly that buys love with food.
During the fading light of dusk, these flies congregate in elaborate, swarming dances above the surface of freshwater streams and forest edges. They perform a series of rhythmic, synchronised manoeuvres. Turning the fundamental struggle for survival into a choreographed performance of twilight vitality.
Beyond their ceremonial displays, dance flies are highly efficient precision hunters. They have long, spindly legs and a downward-pointing proboscis designed for piercing the exoskeleton of their prey. They patrol the air with remarkable agility. Snatching other small flies mid-flight with accuracy that rivals larger dragonflies.
The life cycle begins in damp soil or aquatic margins. The larvae act as beneficial scavengers or predators of other small invertebrates. Making them an integral component of the New Zealand riparian food web.
The riverbank is quiet. The dance flies swarm at dusk. A dancing cloud above the water. The males carry their gifts, wrapped in silk. The females choose. The river flows. The flies do not know they are romantic. They just want to mate.
That is what dance flies do.