Bug Wiki
Sticker of Banana slug
Bug card No. 0090 of 1,500

Banana slug

Ariolimax columbianus
Eats: Leftovers and dead thingsSnails, slugs and wormsForests and woodsNo legsNot an insect, but a bug cousin

The banana slug is a giant slug that is often as yellow as a banana. Some are green, brown or white instead, and many have black spots on their tail. It is the second biggest land slug in the whole world.

Fun fact: this one is not an insect at all, it has no legs! But kids find it on every bug hunt, so it lives in Bug Wiki too.
Lives in
The Pacific coast of North America, from northern California to Alaska, on the damp forest floor
Length
25 cm (9.8 in)
up to
Top speed
about 0.04 km/h (0.02 mph)
On foot, estimate
Can it hurt you?
Harmless
Harmless. Its slime is very sticky, so wash your hands if you touch one.
What does it eat?
It munches on things it finds on the damp forest floor. Seeds it eats come out again somewhere else, which helps new plants grow.
For real!Photo of Banana slug
Picture by Thomas Schoch. CC BY-SA 2.5, via Wikimedia Commons.

How big is it?

How long is it?

Banana slug about 25 cm long (9.8 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)
as long as 8 toy building bricks in a rowas long as 1.5 bananas end to endcould run across a dinner table in 90 seconds

How big is Banana slug compared to YOU?

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

How fast is it?

cool stuff

Fun facts

1

It can grow up to 25 centimetres long, about as long as a ruler.

2

Its colour can change with where it lives and what it eats. The colour can even show if it is healthy or hurt.

3

It helps the forest by carrying seeds to new places.

4

Sometimes its tail has so many black spots that it looks completely black, like an old banana.

you asked

Most asked questions about Banana slug

?How big is a banana slug?

It can grow up to 25 centimetres long. Only one kind of land slug in the world is bigger.

?Why is it called a banana slug?

Because many of them are bright yellow, just like a banana, and some even have black spots like a ripe one.

?Is the banana slug dangerous?

No. It is harmless, just very slimy.

For bug experts

Scientific name
Ariolimax columbianus
Group
Snails, slugs and worms
Family
Ariolimacidae
Classification
Gastropoda > Stylommatophora > Ariolimacidae
Lives on
North America
Also known as
Pacific banana slug

Where the facts come from

  1. Ariolimax columbianus (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 Thomas Schoch. CC BY-SA 2.5, 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: Snails, slugs and worms

Also at home here: Forests and woods