Insects

Wart-biter

Decticus verrucivorus

The wart-biter is a large green bush-cricket mottled with dark, once used to 'bite' warts, hence its curious common and scientific names.

Characteristics

Scientific nameDecticus verrucivorus
SizeLength 24–44 mm
Energy3/5

Temperament

Diurnal, omnivorous, jumper

Diet

Omnivore: other insects and plant matter

Description

The wart-biter is a large orthopteran insect of the bush-cricket family, that is a long-antennaed cricket. It has a robust, stocky body, bright green or yellowish, densely mottled with dark brown. It has large hind legs suited to jumping and powerful jaws. Females bear a long sabre-shaped ovipositor.

Habitat and distribution

It occurs across much of Eurasia. It frequents meadows, pastures and open, sunny clearings, often in hilly and mountainous habitats rich in tall grass and scrub. It favours habitats that are not intensively farmed.

Behaviour and song

It is an omnivorous insect: it feeds on other insects, which it hunts actively, but also on plant matter. It is active by day, when the males utter a characteristic song, a series of short repeated 'ticks' produced by rubbing the wings. With its powerful jaws it can give a firm bite if handled.

Did you know?

Its curious name, both common and scientific ('verrucivorus', meaning 'wart-eater'), comes from an old folk practice, especially Swedish, of letting the insect bite warts, in the hope that its acidic digestive juices would make them disappear.

Notes and conservation

It is a cricket tied to open, well-preserved grassland. In some regions, such as the United Kingdom, it has become rare and protected due to the loss and fragmentation of these habitats through agricultural intensification.

Pros

  • Large, striking mottled green cricket
  • Characteristic song of repeated ticks
  • Indicator of open, well-preserved grassland

Cons

  • Depends on non-intensive meadows and pastures
  • Powerful jaws can bite if handled
  • Rare and protected in some regions

FAQ

Why is it called 'wart-biter'?
The name comes from an old folk practice, especially Swedish, of letting the insect bite warts. It was hoped that its acidic digestive juices would help make them disappear.
Is it dangerous to humans?
No. Its powerful jaws serve to catch prey and chew plants, but if handled it can at most give a firm bite, with no real consequences. It is not venomous.
What does it eat?
It is omnivorous: it actively hunts other insects, but also feeds on plant matter. This mixed diet makes it adaptable to the grassland habitats where it lives.
How do you recognise its song?
The males produce, by rubbing their wings, a series of short repeated 'ticks', clearly audible on warm, sunny days. It is one of the characteristic sounds of tall-grass meadows.

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