Coreus marginatus
In 3 days ~40% in a week ~70%
Coreus marginatus is a herbivorous species of true bug in the family Coreidae. It is commonly known as the dock bug as it feeds on the leaves and seeds of docks and sorrels. It is a medium-sized speckled brown insect, between 13 and 15 mm long as an adult, with a broad abdomen. It occurs throughout Europe, Asia and northern Africa. It is often found in dense vegetation, such as hedgerows and wasteland.
This species was among the first Hemiptera formally described in the scientific literature by the Swedish biologist Carl Linnaeus in 1758, under the name Cimex marginatus. It was transferred to the genus Coreus by the Danish zoologist Johan Fabricius in 1794. It has numerous synonyms and was historically placed in the genus Syromastus.
The specific epithet marginatus refers to the prominent margins of the abdomen. The head, pronotum and abdomen of an adult dock bug are speckled reddish brown. The antennae are composed of four segments, red-orange in colour except for the final fourth segment which is black. Between the antennae are two small projections, known as antenniferous tubercles, which can be used to distinguish this species from other superficially... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cévennes National Park | 🇫🇷 France | |
| 2 | Biebrza National Park | 🇵🇱 Poland | |
| 3 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 4 | Picos de Europa National Park | 🇪🇸 Spain | |
| 5 | Ecrins National Park | 🇫🇷 France | |
| 6 | Aigüestortes National Park | 🇪🇸 Spain | |
| 7 | Białowieża National Park | 🇵🇱 Poland | |
| 8 | Pyrénées National Park | 🇫🇷 France | |
| 9 | Snowdonia National Park | 🇬🇧 United Kingdom | |
| 10 | Tatra National Park | 🇸🇰 Slovakia | |
| 11 | Sierra Nevada National Park | 🇪🇸 Spain | |
| 12 | Triglav National Park | 🇸🇮 Slovenia | |
| 13 | Vanoise National Park | 🇫🇷 France | |
| 14 | Fertő-Hanság National Park | 🇭🇺 Hungary | |
| 15 | Mercantour National Park | 🇫🇷 France | |
| 16 | Sierra de Guadarrama National Park | 🇪🇸 Spain | |
| 17 | Wadden Sea National Park | 🇩🇪 Germany |
Possible
About 20% of wildlife watchers report a Dock Bug sighting in Ecrins National Park on a given day, based on 18 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 54th most-seen of the 251 insects we can rate there. Over three days the chance rises to about 40%, and over a week to about 70%, if each day is a fresh chance.
August and September
In those months about 20% of wildlife watchers report a Dock Bug in Ecrins National Park on a given day, against under 5% in January–April and October, the lowest months.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Dock Bug sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 17 parks where we can rate Dock Bug sightings, Ecrins National Park ranks 5th at about 20%, level with the leaders once rounded. The best odds are in Cévennes National Park (France, about 20%), Biebrza National Park (Poland, about 20%) and Bavarian Forest National Park (Germany, about 20%).
Same order: Hemiptera
The closest relatives of the Dock Bug that you can see in Ecrins National Park (order Hemiptera, True Bugs, Hoppers, Aphids, and allies) are European Striped Shield Bug (about 30%), Spilostethus saxatilis (about 30%) and Sloe Bug (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Dock Bug is recorded against all the insects logged in Ecrins National Park (18 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.
