Osmoderma scabra
In 3 days ~10% in a week ~30%
Osmoderma scabrum, or the rough hermit beetle, is a species in the family Scarabaeidae ("scarab beetles"), in the order Coleoptera ("beetles"). Occurring in eastern North America from Quebec south to Tennessee, it is 14-20 mm long and black, sometimes with a metallic sheen. Adults are nocturnally active and may be found at sap flows or under bark. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Acadia National Park | 🇺🇸 United States | |
| 2 | Great Smoky Mountains National Park | 🇺🇸 United States | |
| 3 | Shenandoah National Park | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Rough Hermit Beetle sighting in Shenandoah National Park on a given day, based on 7 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 447th most-seen of the 723 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
June and July
In those months about 10% of wildlife watchers report a Rough Hermit Beetle in Shenandoah National Park on a given day, against under 5% in August to May, the lowest months.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Rough Hermit Beetle sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 3 parks where we can rate Rough Hermit Beetle sightings, Shenandoah National Park ranks 3rd at about 10%, level with the leaders once rounded. The best odds are in Acadia National Park (United States, about 10%) and Great Smoky Mountains National Park (United States, about 10%).
Same family: Scarabaeidae
The closest relatives of the Rough Hermit Beetle that you can see in Shenandoah National Park (family Scarabaeidae, Scarabs) are Common Green June Beetle (about 20%), Japanese Beetle (about 20%) and Eastern Hercules Beetle (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Rough Hermit Beetle is recorded against all the insects logged in Shenandoah National Park (7 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.
