Sinodendron cylindricum
In 3 days ~40% in a week ~60%
Sinodendron cylindricum, the rhinoceros stag beetle, horned stag beetle, or simply the rhinoceros beetle, is a species of stag beetle native to Europe. It is characterised by a clear sexual dimorphism. The beetles reach a body length of 12 to 16 millimeters and have a very shiny, black body, sometimes with turquoise sheen. Despite being in the family Lucanidae (stag beetles), they look rather like true rhinoceros beetles, which are well known for their rhinoceros-like horn. The body is cylindrical and the elytra and thorax have distinct rows of pits and grooves. The males have a well-developed horn on their heads, which is significantly smaller in the females. In addition, the cavities on the pronotum in the female are much shallower than the distinct cavities in the male. The larvae are white and soft with brown heads.
With the exception of southwestern Spain and Portugal and northern Scandinavia, the species occurs throughout the European continent and the British Isles to western Siberia. The beetle prefers primary deciduous forests at cooler and higher altitudes, but can also be found in old willow stands, avenue and street trees... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Białowieża National Park | 🇵🇱 Poland | |
| 2 | Cairngorms National Park | 🇬🇧 United Kingdom |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Leeds | 🇬🇧 United Kingdom | |
| 2 | Nizhny Novgorod | 🇷🇺 Russia | |
| 3 | Birmingham | 🇬🇧 United Kingdom | |
| 4 | Stockholm | 🇸🇪 Sweden | |
| 5 | Copenhagen | 🇩🇰 Denmark | |
| 6 | Hamburg | 🇩🇪 Germany | |
| 7 | Helsinki | 🇫🇮 Finland | |
| 8 | Moscow | 🇷🇺 Russia |
With luck
About 10% of wildlife watchers report a Horned Stag Beetle sighting in Białowieża National Park on a given day, based on 8 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 82nd most-seen of the 158 insects we can rate there. Over three days the chance rises to about 40%, and over a week to about 60%, if each day is a fresh chance.
June
In that month about 30% of wildlife watchers report a Horned Stag Beetle in Białowieża National Park on a given day, against under 5% in September to May, the lowest months.
Between 2 and 5 pm
Across all the parks we cover, that three-hour window holds the most Horned Stag Beetle sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 2 parks where we can rate Horned Stag Beetle sightings, Białowieża National Park has the highest daily chance: about 10%. Next come Cairngorms National Park (United Kingdom, about 10%).
Same family: Lucanidae
The closest relatives of the Horned Stag Beetle that you can see in Białowieża National Park (family Lucanidae, Stag Beetles) are Lesser Stag Beetle (about 30%) and Platycerus caraboides (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Horned Stag Beetle is recorded against all the insects logged in Białowieża National Park (8 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.
