Bug Wiki
Sticker of Lesser silver water beetle
Bug card No. 2595 of 4,939

Lesser silver water beetle

Hydrochara caraboides
Eats: Leftovers and dead thingsBeetlesPonds, rivers and shores6 legs

The lesser silver water beetle lives in ponds and ditches. Funny thing: it is not silver at all, it is black. It carries a bubble of air under its body, and that bubble shines like silver under water.

Lives in
Europe, in ponds and ditches full of plants
Length
1.5 cm (0.59 in)
Top speed
about 0.71 km/h (0.44 mph)
Swimming, estimate
Can it hurt you?
Harmless
Harmless. It is a calm water beetle.
What does it eat?
It belongs to the water scavenger beetles, which feed on bits of plants and other leftovers in the water.
For real!Photo of Lesser silver water beetle
Picture by Francisco Welter-Schultes. CC0, via Wikimedia Commons.

How big is it?

How long is it?

Lesser silver water beetle about 1.5 cm long (0.59 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)
as long as 2.5 grains of rice in a rowcould swim the length of a bathtub in 10 seconds

How big is Lesser silver water beetle compared to YOU?

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

How fast is it?

cool stuff

Fun facts

1

It traps air with the hairs on its belly, so it can breathe under water like a diver with a tank.

2

In the United Kingdom it lives in only three areas and is protected by law because it is endangered.

3

It likes pools with a floating raft of thick plants in the middle.

4

Cows help it: when they trample the edges of the pools, the beetle finds better places to breed.

you asked

Most asked questions about Lesser silver water beetle

?Why is it called a silver water beetle?

Because the bubble of air under its body shines like silver when it is under water.

?How big is the lesser silver water beetle?

It is about 15 millimetres long.

For bug experts

Scientific name
Hydrochara caraboides
Group
Beetles
Family
Hydrophilidae
Classification
Insecta > Coleoptera > Hydrophilidae
Lives on
Europe

Where the facts come from

  1. Lesser silver water beetle (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 Francisco Welter-Schultes. CC0, 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.

Bug Wiki honey jar For grown-ups: Bug Wiki is free, with no ads and no tracking. A small tip helps keep it online.Leave a tip

More from the same group: Beetles

Also at home here: Ponds, rivers and shores

Honey jarfor grown-ups