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Sticker of Horned spanworm moth
Bug card No. 2271 of 4,939

Horned spanworm moth

Nematocampa resistaria
Eats: PlantsMothsForests and woods6 legs

The horned spanworm moth is a small moth that lives across North America. Its caterpillar is a spanworm, which moves by making a loop with its body. The caterpillars eat the leaves and needles of many trees and bushes.

Lives in
North America, from British Columbia to Nova Scotia and south to Florida and California
Wingspan
1.9 to 2.5 cm (0.75 to 0.98 in)
Top speed
about 11 km/h (6.8 mph)
Flying, estimate
Can it hurt you?
Harmless
Harmless. It cannot bite or sting.
What does it eat?
Its caterpillars eat fir, spruce, hemlock, willow, birch and hazel, and even strawberry and carrot plants.
For real!Photo of Horned spanworm moth
Picture by Mike Boone. CC BY-SA 2.5, via Wikimedia Commons.

How big is it?

How wide are its wings?

Horned spanworm moth wings about 2.5 cm tip to tip (0.98 in)A grain of rice about 6 mm (0.24 in)A toy building brick about 3.2 cm (1.3 in)A crayon about 9 cm (3.5 in)
wings as wide as 4 grains of rice in a rowcould fly across a whole football pitch in 34 seconds

How big is Horned spanworm moth compared to YOU?

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How fast is it?

cool stuff

Fun facts

1

Its caterpillars eat both needle trees and leafy trees, which few caterpillars do.

2

In the north there is one family of moths a year, but in the far south there are several.

3

Scientists once thought it was the same as a moth from Europe and Asia, but then split them apart.

you asked

Most asked questions about Horned spanworm moth

?What does the horned spanworm eat?

Leaves and needles of many trees, like fir, spruce, willow and birch.

?How big is the horned spanworm moth?

Its wings measure about 2 to 2.5 centimetres from tip to tip.

For bug experts

Scientific name
Nematocampa resistaria
Named by
Herrich-Schäffer, 1856
Group
Moths
Family
Geometridae
Classification
Insecta > Lepidoptera > Geometridae
Lives on
North America
Also known as
Filament bearer, Bordered thorn

Where the facts come from

  1. Nematocampa resistaria (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 Mike Boone. CC BY-SA 2.5, 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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Also at home here: Forests and woods

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