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September 12, 2026Short & citedBlog
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Field Notes • Insect

Fly

Flies are insects in the order Diptera, a very large group that includes house flies, fruit flies, blow flies, and many others.

Updated September 12, 20261 min readCited sources

Flies are insects in the order Diptera, a large group that includes house flies, fruit flies, and blow flies. The common house fly is a small insect that feeds on liquids or decaying organic matter and reproduces quickly.

What it is

Flies are a diverse group of insects distinguished by having one pair of functional wings. Many species are closely associated with humans, homes, farms, and waste sites, making them a common pest worldwide.

Why it matters

Flies can spread bacteria and contaminate food, especially in homes, restaurants, and farms. Their rapid reproduction and attraction to decaying matter make them a persistent nuisance and a public health concern.

Key details

House flies typically live 15 to 30 days as adults. They undergo complete metamorphosis, with females laying eggs in moist organic material like garbage or manure. Control focuses on sanitation, removing breeding sites, and sealing entry points.

In short

  • Flies belong to the order Diptera, meaning 'two wings'.
  • House flies live about 15–30 days; lifespan varies by species.
  • They reproduce by laying eggs in moist organic material.
  • Control involves sanitation, traps, and sealing entry points.
Canadian angle

House flies and other common fly species are widespread across Canada, and control guidance is relevant for homes, restaurants, farms, and waste-management settings.

Quick questions

How long do flies live?
It depends on the species. Common house flies usually live about 15–30 days as adults, while some species live shorter or longer lives under different conditions.
What do flies eat?
Many flies feed on liquids, sugars, decaying organic matter, and other soft or moist material. House flies commonly feed on food waste and decomposing organic matter.
How to get rid of flies?
Remove food sources, clean trash and drains, store food in sealed containers, fix screens, eliminate standing water, and use traps or pest control if needed.

Sources

  1. Orkinhttps://www.orkin.com/pests/flies/house-flies/how-long-do-flies-live
    Supports: House fly lifespan, reproduction, and exclusion/sanitation advice.
  2. Terminixhttps://www.terminix.com/other/flies/life-cycle/
    Supports: General fly lifespan ranges, life cycle stages, and control methods.
  3. Orkinhttps://www.orkin.com/pests/flies/house-flies/life-expectancy-of-house-flies
    Supports: House fly life stages and lifespan depending on temperature and conditions.
  4. Orkin Canadahttps://www.orkincanada.ca/blog/how-long-do-house-flies-live/
    Supports: House fly development time in Canadian context.
  5. Wikipediahttps://en.wikipedia.org/wiki/Housefly
    Supports: Basic housefly biology, including typical adult lifespan and winter hibernation.