Interactive Bugs

Bugs

Stag beetle (male)

Lucanus cervus

Britain's biggest beetle. The males have huge antler-like jaws for wrestling rivals.

Size
Males up to about 7.5cm
Look for it
May to July
Where
Old woods, parks and gardens, mostly in the south

My spotter's list

Trundles slowly, then takes a clumsy flight. Move your pointer and see.

When to look

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Stag beetle

Good to know

Six things about the stag beetle

Size

Britain's biggest beetle

Male stag beetles can grow up to about 7.5cm long, jaws and all.

Antlers

Jaws for wrestling

The "antlers" are giant jaws. Males use them to wrestle each other, like stags.

Larvae

Years in the dark

The larvae spend several years underground, eating rotting wood, before they become beetles.

Adults

A short summer

The adult beetles live for only a few weeks in early summer.

Rare

Protected

Stag beetles are protected in Britain and are mostly found in the south and south-east of England.

Flight

Clumsy flyers

On warm summer evenings males fly with a loud whirr, their bodies held almost upright.

The real thing

Photos of the stag beetle

Stag beetle (male), photo 1
Photo: Genealogist, CC BY-SA 3.0, Wikimedia Commons
Stag beetle (male), photo 2
Photo: Andrey Butko, CC BY-SA 3.0, Wikimedia Commons
Stag beetle (male), photo 3
Photo: Simon A. Eugster, CC BY 3.0, Wikimedia Commons
Out and about

How to spot one

Look at dusk on warm evenings in late May and June, mostly in the south of England. Males fly clumsily, upright, around gardens, parks and woodland edges.

Lend a hand

How to help

Leave old tree stumps and dead wood in the ground, or build a log pile with the logs part-buried. The grubs live in rotting wood for years.

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