A large, fast-moving, predatory beetle that hunts at night — one of the gardener's best allies, consuming slugs, aphids, and other pests by the thousand, and a key component of healthy soil ecosystems.
A family of 40,000
Carabidae is one of the largest beetle families — over 40,000 species worldwide. Ground beetles range in size from 2 mm to 35 mm. Most are dark — black, dark brown, or metallic — and fast-moving when disturbed. The violet ground beetle (Carabus violaceus) and the common ground beetle (Pterostichus madidus) are the two most frequently encountered in British gardens.
Night hunters
Ground beetles are largely nocturnal. They emerge at dusk from under stones, log piles, and leaf litter to hunt slugs, earthworms, aphids, small caterpillars, and any invertebrate they can subdue. They’re fast runners and use speed to pursue prey across the soil surface. Some species also climb plants to hunt aphid colonies.
The largest European species, Carabus coriaceus (60 mm), can consume a large slug in minutes.
Garden allies
A healthy population of ground beetles is one of the most effective natural controls for slugs in gardens. Studies have found ground beetles consume more slug eggs than adult slugs — they dig into the soil to access slug egg clusters. Encouraging ground beetles means:
- Maintaining log piles and stone borders (daytime refuges)
- Reducing pesticide use (many pesticides kill ground beetles)
- Leaving leaf litter undisturbed in winter
The bombardier exception
The bombardier beetle (Brachinus spp.) — technically a ground beetle family member — famously ejects a boiling chemical spray (a mixture of hydroquinone and hydrogen peroxide that reacts explosively at 100°C) from its abdomen as a defence. It can fire directed bursts up to 70 times in rapid succession.
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Ground Beetle starts with G and ends with E. Browse other insects along the same letter.
Insects that contain a letter from "Ground Beetle":