Cluster Fly vs Semaphore Fly
Side-by-side species comparison
| Attribute | Cluster Fly | Semaphore Fly |
|---|---|---|
| Scientific Name | Pollenia rudis | Poecilobothrus nobilitatus |
| Order | Diptera | Diptera |
| Family | Calliphoridae | Dolichopodidae |
| Size | 8-10 mm | 5-7 mm |
| Habitat | Gardens | Gardens |
| Diet | Parasites | Omnivores |
| Regions | Europe, North America | Europe |
| Conservation | Least Concern | Least Concern |
Cluster Fly
A medium-sized, dark gray fly with golden-brown hairs on the thorax. In autumn, it gathers in large clusters inside buildings to hibernate, sometimes in the thousands.
Did You Know?
The larvae of this fly are earthworm parasites, burrowing into the worm through its skin and consuming it alive from the inside over several weeks.
Semaphore Fly
A tiny metallic green fly where males have conspicuous white-tipped wings used in semaphore-like courtship displays. It is extremely common around garden ponds and puddles.
Did You Know?
Males stand on mud and wave their white-tipped wings like semaphore flags to attract females watching nearby.