Rove beetles move in where the habitat is right rather than coming from a supplier, although one small species, Atheta coriaria, is sold as a biological control for glasshouses (RHS). Below: how to recognise them, what the devil's coach horse eats, and what keeps them in the garden.
What does it look like?
Rove beetles (family Staphylinidae) are 2 to 30mm long, with elongated bodies and short wing cases that leave most of the abdomen uncovered. Most are black or brown, though some have red wing cases and markings, and there are over 1,000 species in Britain. The devil's coach horse (Ocypus olens), pictured here, is Britain's largest rove beetle at 20 to 30mm (around 28mm, Buglife) and matt black. It hunts invertebrates after dark, crushing them with its pincer-like jaws. When threatened it curls its abdomen up like a scorpion's tail and gives off a foul smell, and it can deliver a painful bite if handled. Larvae are elongated and soft-bodied, with three pairs of legs near the head; the head, thorax and part of the abdomen are usually brown or black, with a creamy-white underside.
Life cycle
Eggs are laid in the soil or in accumulations of organic matter. Larvae stay in the soil or leaf litter, where they feed on other invertebrates and their eggs. The devil's coach horse larva emerges after around 30 days and lives mainly underground (Buglife), and it pupates and overwinters as a pupa before the adult emerges the following spring (Wildlife Trusts). Adults are active on the soil surface from March to October, and the devil's coach horse is seen from April to October.
How to encourage it
Rove beetles live at ground level and are active on the soil surface from March to October. Wood piles, compost heaps and some leaf litter left in borders give them somewhere to shelter and hunt.
Slug pellets, even organic ones, have negative effects on wildlife in the garden (RHS). The devil's coach horse eats slugs, so pellets work against the predator you want.
Why this matters in Scotland
The devil's coach horse is found across the UK (Buglife). The NBN Atlas records service lists 280 Scottish records out of 3,071 for the UK and Crown dependencies, against 1,997 in England and 607 in Wales (retrieved October 2026).
The Scottish records show it is here, but they say little about how common it is in any one garden, and no separate Scottish timing is available, so the UK activity months apply.
What it helps control
The same wood-pile and leaf-litter habitat also suits ground beetles, which are another leek moth predator. Beyond leek moth and slugs, the devil's coach horse takes worms, spiders, woodlice and other invertebrates, and will scavenge carrion. It can be mistaken for an earwig, and it will bite if handled, but it is a predator worth leaving alone.
Myths about rove beetles
“The devil's coach horse beetle's raised-tail scorpion pose means it can sting you”
The devil's coach horse curls its abdomen up over its back like a scorpion's tail when threatened, but that is a display. Its described defences are the posture, a foul-smelling secretion and a bite, and no sting or venom is described (Wildlife Trusts, Buglife).
Our read The scorpion pose is a defensive display, not a stinger.
What to do: Leave it be if you see the pose. It is a warning display, so there is no need to retreat or swat at it.
2 sources
- Wildlife TrustsIt curls up its abdomen like the tail of a scorpion when defending itself, emitting a foul-smelling substance, and can deliver a painful bite.
- BuglifeIts scorpion-like posture will give the game away; it can emit a foul smell from its abdomen and can deliver an impressive bite.
“The devil's coach horse is venomous or dangerous to touch”
Handled carelessly it can deliver a painful bite (Wildlife Trusts) or an impressive one (Buglife), and no venom is described. The bite is something to avoid rather than something to fear.
Our read A painful bite and a dangerous animal are not the same claim: the bite is a reason to leave the beetle alone, not a medical concern.
What to do: Do not pick one up between bare fingers.
2 sources
- Wildlife TrustsThe devil's coach horse can deliver a painful bite to humans if handled.
- BuglifeFor its size the devil's coach horse has very large jaws and can deliver an impressive bite, so it's best left alone rather than picked up.
“The devil's coach horse itself is a pest to get rid of, not a beneficial insect”
It is a carnivorous predator, not a plant-feeder. Its prey includes slugs, worms, spiders, woodlice, other invertebrates and carrion (Buglife), and rove beetles as a whole are largely predatory, active on the soil surface (RHS).
Our read Nothing in its described diet touches crops or ornamentals. The confusion probably comes from its size, dark colour and defensive display.
What to do: Leave wood piles, compost heaps and leaf litter undisturbed to give it somewhere to shelter and hunt; it's working in your favour against slugs and other soft-bodied pests.
“The devil's coach horse is easily mistaken for an earwig”
The devil's coach horse can sometimes be mistaken for an earwig, but its scorpion-like posture when threatened gives it away (Buglife).
Our read A dark elongate beetle taken for an unwanted insect is at risk of being swatted before anyone looks closely, which would lose a predator of slugs and other invertebrates.
What to do: Check for the raised-tail posture before assuming an unfamiliar dark beetle is a pest. If it curls its abdomen up when disturbed, it's a devil's coach horse, not an earwig, and worth leaving to get on with hunting.
1 source
- BuglifeThe devil's coach horse can sometimes be mistaken for an earwig, but its scorpion-like posture when threatened gives it away.
Frequently asked questions
Is the devil's coach horse dangerous?
It is not described as venomous or as having a sting. It can deliver a painful bite if handled, so leave it alone.
Can I buy rove beetles?
Not for the garden: they arrive with wood piles, compost heaps and leaf litter. One small species, Atheta coriaria, is sold for glasshouse pests such as fungus gnat larvae, red spider mite and aphids (RHS).
Is it an earwig?
It can be mistaken for one, but the devil's coach horse raises its abdomen like a scorpion's tail when threatened, which gives it away (Buglife).
When will I see them?
Adult rove beetles are active from March to October, and the devil's coach horse is seen from April to October, hunting mostly after dark.
Sources
Show the 6 sources
- RHS: For Leek Moth: Predators such as ground and rove beetles are likely to consume some pupae.
- Buglife: For Slugs and Snails: Buglife's devil's coach horse page names slugs among its prey, alongside worms, spiders, woodlice, other invertebrates and carrion. Devil's coach horse: around 28mm, prey of slugs, worms, spiders, woodlice, other invertebrates and carrion, scorpion-like posture and foul smell as defence, an impressive bite, sometimes mistaken for an earwig, seen April to October across the UK, larva emerging after around 30 days and living mainly underground.
- RHS: RHS ground beetles and rove beetles page: rove beetles 2 to 30mm long with over 1,000 species in Britain, elongate bodies with short wing cases, the devil's coach horse as Britain's largest rove beetle at 20 to 30mm, eggs in soil or organic matter, soft-bodied larvae with three pairs of legs near the head, active March to October, and wood piles, compost heaps and leaf litter as habitat.
- Wildlife Trusts: Devil's coach horse: hunts invertebrates after dark in gardens and on grasslands, curls its abdomen like a scorpion's tail and emits a foul-smelling substance when defending itself, can deliver a painful bite, seen April to October.
- RHS: Slug pellets, even organic ones, have been shown to have negative effects on wildlife in the garden.
- NBN Atlas Scotland: NBN Atlas records service, retrieved 12 October 2026: 3,071 records of the devil's coach horse (Ocypus olens), of which 1,997 in England, 607 in Wales and 280 in Scotland.