Decticus verrucivorus
In 3 days ~50% in a week ~80%
The wart-biter (Decticus verrucivorus) is a bush-cricket in the family Tettigoniidae. Its common and scientific names derive from the eighteenth-century Swedish practice of allowing the crickets to nibble at warts to remove them.
Adult wart-biters are 31–37 millimetres (1.2–1.5 in), with females being significantly larger than males. They are typically dark green in colour, and shiny, always with at least some dark brown mottling or blotches on the pronotum and wings; a largely dark brown morphotype also occurs, though still mottled with some green. The female has a 20 mm long and slightly upcurved ovipositor. Their colour acts as effective camouflage in grassy surroundings.
The wart-biter has a song consisting of a rapidly repeated series of short bursts of clicks starting slowly and speeding up, sometimes lasting for several minutes; it only sings in sunny weather. Wart-biters normally move around by walking; they rarely fly, except when frightened. Most can only fly 3 to 4 metres (10 to 13 ft) at a time.
The Orthoptera Species File lists: D. verrucivorus assiduus Ingrisch, Willemse & Heller, 1992 D. verrucivorus brevipennis Götz, 1970 D. verrucivorus... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Mercantour National Park | 🇫🇷 France | |
| 2 | Ecrins National Park | 🇫🇷 France | |
| 3 | Vanoise National Park | 🇫🇷 France | |
| 4 | Aigüestortes National Park | 🇪🇸 Spain | |
| 5 | Triglav National Park | 🇸🇮 Slovenia | |
| 6 | Kiskunság National Park | 🇭🇺 Hungary | |
| 7 | Pyrénées National Park | 🇫🇷 France | |
| 8 | Hohe Tauern National Park | 🇦🇹 Austria | |
| 9 | Biebrza National Park | 🇵🇱 Poland | |
| 10 | Cévennes National Park | 🇫🇷 France | |
| 11 | Tatra National Park | 🇸🇰 Slovakia | |
| 12 | Fertő-Hanság National Park | 🇭🇺 Hungary | |
| 13 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 14 | Wadden Sea National Park | 🇩🇪 Germany |
Possible
About 20% of wildlife watchers report a Wart-Biter sighting in Biebrza National Park on a given day, based on 11 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 40th most-seen of the 97 insects we can rate there. Over three days the chance rises to about 50%, and over a week to about 80%, if each day is a fresh chance.
June
In that month about 40% of wildlife watchers report a Wart-Biter in Biebrza National Park on a given day, against under 5% in March–April and September–October, the lowest months. December has too few records to rate.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Wart-Biter sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
9th of 14
Of the 14 parks where we can rate Wart-Biter sightings, Biebrza National Park ranks 9th at about 20%. The best odds are in Mercantour National Park (France, about 50%), Ecrins National Park (France, about 40%) and Vanoise National Park (France, about 40%). All parks ranked.
Same order: Orthoptera
The closest relatives of the Wart-Biter that you can see in Biebrza National Park (order Orthoptera, Grasshoppers, Crickets, and Katydids) are European Field Cricket (about 30%), European Mole Cricket (about 20%) and Gold Grasshopper (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Wart-Biter is recorded against all the insects logged in Biebrza National Park (11 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
