Rugose Stag Beetle

Rugose Stag Beetle

Sinodendron rugosum

Daily sighting probability ~10% · With luck
at Seattle

In 3 days ~10% in a week ~30%

50 Verified sightings at Seattle
25 In all 2 parks From 2019 to 2026
June Best month
☀️ Diurnal When it's spotted

About the Rugose Stag Beetle

Sinodendron rugosum is a species of the family Lucanidae, the stag beetles. It is commonly referred to as the rugose stag beetle, and is the only known member of the genus Sinodendron to occur in western North America. Wikipedia →

Global Distribution

Parks Where Found

# Park Country Daily sighting probability
1 Olympic National Park 🇺🇸 United States
~10%
2 Great Bear Rainforest 🇨🇦 Canada
<5%

Cities Where Found

# City Country Daily sighting probability
1 Portland 🇺🇸 United States
~10%
2 Seattle 🇺🇸 United States
~10%
3 Vancouver 🇨🇦 Canada
<5%

Before you go

What are the chances of seeing a Rugose Stag Beetle in Seattle?

With luck

About 10% of wildlife watchers report a Rugose Stag Beetle sighting in Seattle on a given day, based on 50 verified sightings from GBIF citizen-science data. It is the 109th most-seen of the 428 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.

When is the best time to see a Rugose Stag Beetle in Seattle?

June to August

In those months about 10% of wildlife watchers report a Rugose Stag Beetle in Seattle on a given day, against under 5% in September to May, the lowest months. Those are among Seattle's driest months, with about 35 mm of rain a month against 190 mm in November.

What time of day is best to see a Rugose Stag Beetle?

Between 2 and 5 pm

Across all the parks we cover, that three-hour window holds the most Rugose 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.

Is Seattle the best place to see a Rugose Stag Beetle?

Among the best

Of the 3 cities where we can rate Rugose Stag Beetle sightings, Seattle ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Portland (United States, about 10%).

Where does the Rugose Stag Beetle sighting chance come from?

GBIF citizen-science records

It is estimated from how often the Rugose Stag Beetle is recorded against all the insects logged in Seattle (50 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.

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