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Sticker of Greenhead horse fly
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Greenhead horse fly

Tabanus nigrovittatus
Eats: BloodFlies and mosquitoesPonds, rivers and shores6 legs

The greenhead horse fly is a horse fly with big shiny green eyes. It is about as big as a house fly, smaller than most horse flies. It lives by salty marshes on the east coast of the United States, and the girls are famous for their painful bites.

Lives in
Coastal salt marshes and wetlands of the eastern United States
Top speed
about 25 km/h (16 mph)
Flying, estimate
Can it hurt you?
Can bite or sting
The females bite, and the bite hurts and itches more than a mosquito bite, but it is not dangerous for most people. Long sleeves help on the beach in summer.
What does it eat?
Only the females drink blood, from people and animals, because they need it to lay more eggs. The larvae live in mud and hunt other small creatures.
For real!Photo of Greenhead horse fly
Picture by Maximilian Paradiz from Merida, Mexico. CC BY 2.0, via Wikimedia Commons.

How fast is it?

cool stuff

Fun facts

1

It does not poke like a mosquito. It cuts the skin with mouthparts like tiny scissors and then drinks.

2

A female can lay about 100 to 200 eggs after each blood meal.

3

Its larvae live in the muddy marsh for one or two years before they turn into flies.

4

People put up special black box traps in the marshes to catch them.

5

They are most common from late June to August.

you asked

Most asked questions about Greenhead horse fly

?Do greenhead flies bite?

Yes, the females do. Their bites hurt and itch more than mosquito bites.

?Why do greenheads bite?

The female needs blood to make more eggs. The males do not bite.

?When are greenhead flies worst?

From late June to August, near salt marshes on the east coast of the United States.

For bug experts

Scientific name
Tabanus nigrovittatus
Group
Flies and mosquitoes
Family
Tabanidae
Classification
Insecta > Diptera > Tabanidae
Lives on
North America
Also known as
Salt marsh greenhead, Greenhead fly, Greenhead, Greenfly

Where the facts come from

  1. Tabanus nigrovittatus (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 Maximilian Paradiz from Merida, Mexico. CC BY 2.0, Wikimedia Commons. The round sticker of this bug is cut from the same picture.

If we got something wrong, sorry, we are bug fans, not a science journal. Tell us at hello@bugwiki.app and we will fix it.

More from the same group: Flies and mosquitoes

Also at home here: Ponds, rivers and shores