Prionus coriarius
In 3 days ~20% in a week ~40%
Prionus coriarius (sometimes referred to as "the tanner" or "the sawyer") is a species of longhorn beetle. Prionus coriarius can reach a length of 18–45 millimetres (0.71–1.77 in). It is the most massive of European beetles. The female is larger than the male. Body is shiny, dark brown to black. The neck shield bears on each side three clearly distinct teeth. The serrated antennae of the male are composed of 12 segments. The ventral surface of the female is hairless, while in the male is pubescent.
The larvae are polyphagous, but they mainly develop in rotten wood of deciduous and coniferous trees. They can reach a length of about 60 millimetres (2.4 in). The life cycle lasts at least 3 years. Adults can be found from July to September. Its activity is mainly crepuscular and nocturnal.
This species is common in most of Europe and it is present in North Africa and in the Near East (Turkey, Caucasus, Transcaucasia, Iran). Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Białowieża National Park | 🇵🇱 Poland | |
| 2 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 3 | Cévennes National Park | 🇫🇷 France | |
| 4 | Pyrénées National Park | 🇫🇷 France | |
| 5 | Sierra de Guadarrama National Park | 🇪🇸 Spain |
With luck
About 10% of wildlife watchers report a The Tanner sighting in Cévennes National Park on a given day, based on 20 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 345th most-seen of the 996 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
June to August
In those months about 10% of wildlife watchers report a The Tanner in Cévennes National Park on a given day, against under 5% in September to May, the lowest months. Those are among Cévennes National Park's driest months, with about 60 mm of rain a month against 260 mm in October.
Between 9 pm and midnight
Across all the parks we cover, that three-hour window holds the most The Tanner sightings with a recorded time, and about half of them come between 6 am and 6 pm: it is seen both by day and at night.
3rd of 5
Of the 5 parks where we can rate The Tanner sightings, Cévennes National Park ranks 3rd at about 10%. The best odds are in Białowieża National Park (Poland, about 40%) and Bavarian Forest National Park (Germany, about 10%).
Same family: Cerambycidae
The closest relatives of the The Tanner that you can see in Cévennes National Park (family Cerambycidae, Longhorn Beetles) are Spotted Longhorn Beetle (about 20%), Great Capricorn Beetle (about 20%) and Stenopterus rufus (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the The Tanner is recorded against all the insects logged in Cévennes National Park (20 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.
