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Sticker of Shiny blue bottle fly
Bug card No. 3811 of 4,939

Shiny blue bottle fly

Cynomya cadaverina
Name means: “that feeds on dead bodies, from Latin”

The shiny blue bottle fly is a fairly big fly with a gleaming metallic blue tummy. It is one of nature's clean-up crew, because its maggots eat dead animals. It likes cool weather and is busiest in spring and autumn.

Lives in
North America, mostly southern Canada and the northern United States
Length
0.9 to 1.4 cm (0.35 to 0.55 in)
Top speed
about 11 km/h (6.8 mph)
Flying, estimate
Can it hurt you?
Harmless
It does not bite or sting. Like other flies that visit dead animals, it can carry germs, so keep it away from your food.
What does it eat?
Its maggots feed on dead animals and help clear them away.
For real!Photo of Shiny blue bottle fly
Picture by Judy Gallagher. CC BY 2.0, via Wikimedia Commons.

How big is it?

How long is it?

Shiny blue bottle fly about 1.4 cm long (0.55 in)A grain of rice about 6 mm (0.24 in)A toy building brick about 3.2 cm (1.3 in)
as long as 2.5 grains of rice in a rowcould fly across a whole football pitch in 34 secondsmoves 220 times its own body length every second

How big is Shiny blue bottle fly compared to YOU?

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How fast is it?

cool stuff

Fun facts

1

It spends the winter as a grown-up fly and sometimes comes into houses to stay warm.

2

In a good year it can have around 17 families, one after another.

3

From egg to grown-up fly takes only about 17 to 19 days.

4

Scientists who study insects can use this fly to work out how long ago an animal died.

you asked

Most asked questions about Shiny blue bottle fly

?Is the shiny blue bottle fly dangerous?

It does not bite or sting, but it can carry germs, so it should not walk on your food.

?Why do shiny blue bottle flies come into houses?

They spend the winter as grown-ups and sometimes look for a warm place inside.

For bug experts

Scientific name
Cynomya cadaverina
Named by
Robineau-Desvoidy, 1830
Group
Flies and mosquitoes
Family
Calliphoridae
Classification
Insecta > Diptera > Calliphoridae
Lives on
North America

Where the facts come from

  1. Cynomya cadaverina (Wikipedia, CC BY-SA 4.0): what it looks like, where it lives, what it eats, sizes and fun facts, retold in simple words.
  2. Picture by Judy Gallagher. CC BY 2.0, Wikimedia Commons. The sticker of this bug is drawn from this picture.

If we got something wrong, sorry, we are bug fans, not a science journal. Tell us at [email protected] and we will fix it.

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