Yellow Swarming Fly vs Small-headed Fly
Side-by-side species comparison
| Attribute | Yellow Swarming Fly | Small-headed Fly |
|---|---|---|
| Scientific Name | Thaumatomyia notata | Ogcodes pallidipennis |
| Order | Diptera | Diptera |
| Family | Chloropidae | Acroceridae |
| Size | 2-2.5 mm | 4-8 mm |
| Habitat | Grasslands | Grasslands |
| Diet | Predators | Parasitoids |
| Regions | Europe | Europe |
| Conservation | Least Concern | Least Concern |
Yellow Swarming Fly
A tiny yellow fly famous for forming enormous hibernation aggregations in buildings, sometimes numbering millions. Larvae are predatory on root aphids in grassland.
Did You Know?
Can form hibernation clusters of millions in attic spaces, with individual aggregations weighing several kilograms.
Small-headed Fly
A round-bodied fly with a tiny head whose larva parasitizes spiders from the inside.
Did You Know?
The first-instar larva attaches to a passing spider and burrows inside to feed.