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Sticker of Japanese silk moth
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Japanese silk moth

Antheraea yamamai
Eats: Nothing as a grown-upMothsForests and woods6 legs

The Japanese silk moth is a big moth with wide wings, wider than a grown-up's hand. Its caterpillars spin cocoons of white silk that is very strong and stretchy. People in Japan have been raising it for its silk for more than 1000 years.

Lives in
East Asia, and brought to south-eastern Europe, in oak woods
Wingspan
11 to 15 cm (4.3 to 5.9 in)
Top speed
about 27 km/h (17 mph)
Flying, estimate
Can it hurt you?
Harmless
Harmless. It cannot bite or sting.
What does it eat?
The grown-up moths do not eat. The caterpillars eat mostly oak leaves, and sometimes beech, chestnut and rose leaves.
For real!Photo of Japanese silk moth
Picture by unknown author. CC BY-SA 3.0, via Wikimedia Commons.

How big is it?

How wide are its wings?

Japanese silk moth wings about 15 cm tip to tip (5.9 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 14 seconds

How big is Japanese silk moth compared to YOU?

Just maths in your browser. Nothing is saved or sent anywhere.

How fast is it?

cool stuff

Fun facts

1

Its silk is naturally white, very strong and stretchy, but it is hard to dye in colours.

2

Today its silk is very rare and expensive.

3

People brought it to Europe to make silk, and now it lives wild in Austria, Italy and the Balkans, and is spreading north.

4

The moths fly in late summer, from August to September.

you asked

Most asked questions about Japanese silk moth

?What is the Japanese silk moth used for?

For its silk. Its cocoons give a white silk that is very strong and stretchy.

?What does the Japanese silk moth caterpillar eat?

Mostly oak leaves, but also beech, chestnut and other leaves.

?How big is the Japanese silk moth?

Its wings are about 11 to 15 centimetres across.

For bug experts

Scientific name
Antheraea yamamai
Named by
Guérin-Méneville, 1861
Group
Moths
Family
Saturniidae
Classification
Insecta > Lepidoptera > Saturniidae
Lives on
Asia, Europe
Also known as
Japanese oak silkmoth

Where the facts come from

  1. Antheraea yamamai (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 unknown author. CC BY-SA 3.0, 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 [email protected] and we will fix it.

More from the same group: Moths

Also at home here: Forests and woods