Rosalia funebris
In 3 days ~20% in a week ~40%
The Banded Alder Borer (Rosalia funebris) is a member of the very diverse family of longhorn beetles. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Great Bear Rainforest | 🇨🇦 Canada | |
| 2 | Olympic National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Portland | 🇺🇸 United States | |
| 2 | Seattle | 🇺🇸 United States | |
| 3 | Vancouver | 🇨🇦 Canada | |
| 4 | Los Angeles | 🇺🇸 United States | |
| 5 | San Francisco | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Banded Alder Borer sighting in Olympic National Park on a given day, based on 17 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 72nd most-seen of the 207 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.
July and August
In those months about 10% of wildlife watchers report a Banded Alder Borer in Olympic National Park on a given day, against under 5% in September to June, the lowest months. Those are among Olympic National Park's driest months, with about 40 mm of rain a month against 370 mm in November.
Between 3 and 6 pm
Across all the parks we cover, that three-hour window holds the most Banded Alder Borer sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 2 parks where we can rate Banded Alder Borer sightings, Olympic National Park ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Great Bear Rainforest (Canada, about 10%).
Same family: Cerambycidae
The closest relatives of the Banded Alder Borer that you can see in Olympic National Park (family Cerambycidae, Longhorn Beetles) are White-Spotted Sawyer (about 10%), Pachyta armata (about 10%) and Etorofus obliteratus (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Banded Alder Borer is recorded against all the insects logged in Olympic National Park (17 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.
