Prionus coriarius
In 3 days ~20% in a week ~30%
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 Vienna on a given day, based on 60 verified sightings from GBIF citizen-science data. It is the 302nd most-seen of the 1406 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 30%, if each day is a fresh chance.
July and August
In those months about 10% of wildlife watchers report a The Tanner in Vienna on a given day, against under 5% in September to June, the lowest months. Those are among Vienna's wettest months, with about 85 mm of rain a month against 40 mm in February.
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.
Among the best
Of the 14 cities where we can rate The Tanner sightings, Vienna ranks 9th at about 10%, level with the leaders once rounded. The best odds are in Kharkiv (Ukraine, about 10%), Kyiv (Ukraine, about 10%) and Moscow (Russia, about 10%).
Same family: Cerambycidae
The closest relatives of the The Tanner that you can see in Vienna (family Cerambycidae, Longhorn Beetles) are Alpine Longhorn Rosalia (about 10%), Common Grammoptera (about 10%) and Dorcadion aethiops (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 Vienna (60 verified sightings), 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.
