Species Guide

European Hornet (Vespa crabro)

Britain's largest social wasp — and one of the most misunderstood. Big, loud, night-flying, but markedly less aggressive than a common wasp. This guide covers identification, nesting habits, and what to do if you find a hornet nest on your property.

Close-up of a European hornet on a wooden post

The European hornet (Vespa crabro) is the UK's only native true hornet. It has been here for centuries, plays a valuable ecological role hunting flies, beetles and caterpillars, and is fundamentally different in temperament from the common wasps most people are familiar with. Where wasps are bold, persistent and quick to defend the colony, hornets are wary, quiet at distance, and largely uninterested in humans.

Identification at a glance

Feature	European hornet	Common wasp	Asian hornet
Worker size	25-30mm	10-20mm	20-25mm
Queen size	30-35mm	20mm	30mm
Body colour	Brown and yellow-orange	Bright yellow and black	Almost entirely dark brown / black
Abdomen pattern	Yellow with brown stripes	Bold black-on-yellow	Single orange-yellow band on segment 4 only
Legs	Brown / amber throughout	Black or dark	Bright yellow tips — diagnostic
Head / face	Reddish-brown	Yellow and black	Black with orange face
Active at night?	YES — strongly attracted to lights	No	No
Sound	Loud, deep droning buzz	Standard wasp buzz	Quieter than European hornet
Typical nest location	Hollow trees, loft voids, big bird boxes	Lofts, eaves, sheds, ground	High in tree canopies (often 10m+)
Colony size at peak	500-750	3,000-5,000+	Up to 6,000 (south of UK)

Behaviour — what makes hornets different

European hornets ignore food and drink at outdoor tables. They are not the species that ruins your barbecue or crawls inside a cider can — that is the common wasp. Hornets are predators, not scavengers, and spend their days hunting other flying insects to feed the colony's larvae.

They are also one of the few social wasps active after dark. Hornets routinely forage on summer nights and are strongly attracted to artificial light. If something the size of your thumb is repeatedly hitting a lit window or porch lamp in July, it is a European hornet, and the simplest fix is to turn the light off.

Around the nest, hornets are vigilant and will defend with commitment if they sense vibration or breath close to the entrance — but the trigger distance is much smaller than for a wasp colony. A hornet nest 5 metres away in a high tree usually poses very little day-to-day risk.

Where European hornets build nests

Hollow tree trunks and large dead branches — the natural choice
Disused chimneys and disused flue voids in older properties
Loft spaces, especially timber-framed and rural buildings
Wall cavities of old stone, brick and lime-mortared buildings
Large bird boxes and bat boxes
Roof voids of substantial sheds, summerhouses and barns

Hornets prefer larger cavities than common wasps because the colony needs more headroom for the larger nest structure. The entrance hole is usually at the bottom of the nest, facing downward — a useful identification feature when you can see the nest itself.

Are European hornet stings dangerous?

A hornet sting hurts more than a wasp sting because the venom dose per sting is roughly three times larger. The chemistry, however, is similar — and so is the medical risk. For most people, a single hornet sting causes intense local pain for 10-20 minutes, swelling for 24-48 hours, and nothing more. For anyone with a confirmed wasp or hornet venom allergy, a hornet sting can trigger anaphylaxis just as a wasp sting can, and the same emergency response applies.

See our sting and allergy first-aid guide for the full protocol — it applies equally to hornet stings.

Should you leave a European hornet nest alone?

It depends on three things: where the nest is, how close it is to people, and how late in the season it is. We are happy to give an honest assessment on the phone before booking. Sometimes the answer genuinely is "leave it" — particularly for a high tree nest discovered in late August, where the colony will die off naturally within a few weeks anyway.

When treatment is the right call

Nest in or on the house — loft, wall cavity, chimney
Nest within 5 metres of where children play
Nest near a doorway, footpath or driveway used daily
Anyone in the household with a confirmed venom allergy
Nest discovered before mid-August (the colony still has weeks of growth ahead of it)

How we treat a European hornet nest

Confirm the species and locate the entrance from a safe distance.
Apply professional-grade insecticide at the entry point — we do not need to open up the structure.
Colony inactive within 2-4 hours — same chemistry, same timing as wasp treatment.
Single visit in 95% of cases. Free revisit if any activity persists.
No hornet premium — same fixed price as wasp work, from £99.

Related guides

Frequently asked questions — European hornets

Are European hornets actually dangerous?+

No more than common wasps in terms of medical risk — venom strength is broadly similar and the risk of anaphylaxis is comparable. The sting feels more painful because the venom volume is larger. Crucially, European hornets are notably less aggressive than wasps and will not bother you at a picnic.

Why is there a hornet hitting my window at night?+

European hornets are the only UK social wasp active after dark, and they are strongly attracted to artificial light. A hornet repeatedly flying at a lit window or lamp on a summer evening is almost certainly Vespa crabro. Turn the lights off, close the curtains and it will leave.

Is it true European hornets are protected?+

European hornets are not legally protected in the UK — that is a common myth. They can be treated where they pose a risk. However, because colonies are smaller and the species is ecologically beneficial, leaving an isolated nest far from people is often the better choice if circumstances allow.

How do I tell a European hornet from an Asian hornet?+

Check the legs. European hornets have brown or amber legs. Asian hornets have unmistakeable bright yellow leg tips, a much darker body, and a single orange band on the abdomen rather than the European hornet's brown-and-yellow striped abdomen. If unsure, send a photo via WhatsApp before doing anything.

Do European hornet nests get bigger than wasp nests?+

The physical structure is often larger because individual cells are larger, but the colony population is much smaller — typically 500-750 hornets at peak compared to 5,000+ in a mature common wasp colony. Nests are normally built in hollow trees, loft voids or large bird boxes.

European hornet nest on your property? Call 01727 789571 or 0800 046 3473. Same-day service across Hertfordshire and North London. Fixed price from £99 — no hornet premium. Free revisit guaranteed.