Interactive Night

Night

Glow-worm

Lampyris noctiluca

Not a worm but a beetle: the female glows green on summer nights to call the males.

Size
Females up to about 2.5cm
Look for it
June to August
Where
Grassland, hedge banks and railway banks

My spotter's list

Crawls after you with its tail glowing. Move your pointer and see.

When to look

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Glow-worm

Good to know

Six things about the glow-worm

Beetle

Not a worm

Glow-worms are beetles. The glowing females have no wings, so they look a bit like a grub.

Light

A light to call by

The female climbs a grass stem at night and glows to attract the flying males.

Chemistry

Cold light

The glow comes from a chemical reaction in her tail. It makes light but almost no heat.

Food

Snail hunters

The larvae hunt snails, injecting them with juices that soften them up.

Adults

No time to eat

The adult glow-worms don't eat at all. They live for only a couple of weeks.

When

Look in June and July

The best time to see them glowing is on a warm, dark night in June or July.

The real thing

Photos of the glow-worm

Glow-worm, photo 1
Photo: Tavo Romann, CC BY-SA 4.0, Wikimedia Commons
Glow-worm, photo 2
Photo: Tero Keski-Valkama, CC0, Wikimedia Commons
Glow-worm, photo 3
Photo: Emphyrio1983, CC BY-SA 4.0, Wikimedia Commons
Out and about

How to spot one

Walk slowly along grassy banks, verges and woodland edges on warm, dark nights in June and July, without a torch, and look for a steady green point of light.

Lend a hand

How to help

Keep outdoor lighting low, as it stops males finding the glowing females. Leave long grass, and snails for the larvae to eat.

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