- 3mm in length. Yellow–brown or mottled in colour with bright red eyes.
- Abdomen hangs down in flight, which is slow.
- Tend to hover.
- Female can lay up to 500 eggs.
- Develops to adult in about 7 days.
- Adult only lives for about 2 weeks.
- Breeds in fermenting residues found in pubs, fruit & vegetables, breweries, etc.
- Larvae feeds on bacteria and yeast in rotting fruit and veg.
- May also breed in unclean drains and cleaning utensils.