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Sticker of Yellow-spotted millipede
Bug card No. 1494 of 1,500

Yellow-spotted millipede

Harpaphe haydeniana
Eats: Leftovers and dead thingsCentipedes and millipedesForests and woodsLots of legsNot an insect, but a bug cousin

The yellow-spotted millipede is a shiny black millipede with bright yellow spots along its sides. The yellow is a warning: when it is bothered, it lets out a liquid that smells like almonds and tastes horrible to hungry animals. It lives on the damp floor of big forests.

Fun fact: this one is not an insect. Insects have six legs, and this cousin has many, many more.
Lives in
The Pacific coast of North America, from Alaska to California, in moist forests
Length
4 to 5 cm (1.6 to 2 in)
Top speed
about 0.22 km/h (0.14 mph)
On foot, estimate
Can it hurt you?
Harmless
Not dangerous to people, but its liquid can sting your eyes, nose or mouth. If you touch one, wash your hands.
What does it eat?
It eats fallen leaves and helps turn them back into soil. The young ones eat rich, crumbly soil called humus.
For real!Photo of Yellow-spotted millipede
Picture by (c) Cricket Raspet, some rights reserved (CC BY). CC BY 4.0, via Wikimedia Commons.

How big is it?

How long is it?

Yellow-spotted millipede about 5 cm long (2 in)A toy building brick about 3.2 cm (1.3 in)A crayon about 9 cm (3.5 in)A banana about 18 cm (7.1 in)
as long as 8 grains of rice in a rowas long as 1.5 toy building bricks in a rowit has about 62 legscould run across a dinner table in 16 seconds

How big is Yellow-spotted millipede compared to YOU?

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How fast is it?

cool stuff

Fun facts

1

Its almond smell comes from a tiny bit of a strong poison called cyanide that it uses to protect itself.

2

Females have 31 pairs of legs, and males have 30 pairs.

3

It can live for two to three years.

4

Very few animals eat it, but one kind of ground beetle has learned to hunt it.

5

It is often found in redwood forests, sometimes many of them close together.

you asked

Most asked questions about Yellow-spotted millipede

?Is the yellow-spotted millipede poisonous?

It makes a liquid with cyanide to scare off enemies. It is not dangerous to people, but it can irritate your eyes or mouth, so wash your hands after touching it.

?How many legs does the yellow-spotted millipede have?

Females have 62 legs and males have 60.

?Why does it smell like almonds?

Its defence liquid contains cyanide, which smells like almonds.

For bug experts

Scientific name
Harpaphe haydeniana
Group
Centipedes and millipedes
Family
Xystodesmidae
Classification
Diplopoda > Polydesmida > Xystodesmidae
Lives on
North America
Also known as
Almond-scented millipede, Cyanide millipede

Where the facts come from

  1. Harpaphe haydeniana (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) Cricket Raspet, some rights reserved (CC BY). CC BY 4.0, 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: Centipedes and millipedes

Also at home here: Forests and woods