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Sticker of Ceanothus silk moth
Bug card No. 0830 of 4,939

Ceanothus silk moth

Hyalophora euryalus
Eats: Nothing as a grown-upMothsForests and woods6 legs

The ceanothus silk moth is a big reddish brown moth with black and white spots. It has fluffy black feelers. Its wing spots look like the eyes of a bigger animal, which scares hungry birds away.

Lives in
Western North America, from Canada to Mexico, in forests and valleys
Wingspan
8.9 to 13 cm (3.5 to 5 in)
Top speed
about 25 km/h (16 mph)
Flying, estimate
Can it hurt you?
Harmless
Harmless. It cannot bite or sting.
What does it eat?
Grown-up moths have no working mouth and never eat. The caterpillars munch leaves of many trees and bushes, like ceanothus, willow, birch and alder.
For real!Photo of Ceanothus silk moth
Picture by (c) Laura Gaudette, some rights reserved (CC BY). CC BY 4.0, via Wikimedia Commons.

How big is it?

How wide are its wings?

Ceanothus silk moth wings about 13 cm tip to tip (5 in)A crayon about 9 cm (3.5 in)A banana about 18 cm (7.1 in)A house cat about 50 cm (20 in)
wings as wide as your handcould fly across a whole football pitch in 15 seconds

How big is Ceanothus silk moth compared to YOU?

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How fast is it?

cool stuff

Fun facts

1

A grown-up moth lives only about one or two weeks, because it cannot eat.

2

Its caterpillar starts out black and turns green. It has yellow to orange red spikes on its back.

3

It spends the winter inside a silk cocoon that can survive minus 30 degrees.

4

The moths fly at night and find each other by smell, using their fluffy feelers.

5

Native people in California put its cocoons into hand rattles.

you asked

Most asked questions about Ceanothus silk moth

?How big is the ceanothus silk moth?

Its wings are 9 to 13 centimetres across, as big as a grown-up's hand.

?What does the ceanothus silk moth eat?

The adult eats nothing at all. The caterpillar eats leaves of many trees and bushes.

For bug experts

Scientific name
Hyalophora euryalus
Named by
Boisduval, 1855
Group
Moths
Family
Saturniidae
Classification
Insecta > Lepidoptera > Saturniidae
Lives on
North America
Also known as
Ceanothus silkmoth

Where the facts come from

  1. Hyalophora euryalus (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 (c) Laura Gaudette, some rights reserved (CC BY). CC BY 4.0, 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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