Rosalia funebris
In 3 days ~30% in a week ~50%
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 Portland on a given day, based on 207 verified sightings from GBIF citizen-science data. It is the 39th most-seen of the 507 insects we can rate there. Over three days the chance rises to about 30%, and over a week to about 50%, if each day is a fresh chance.
July
In that month about 30% of wildlife watchers report a Banded Alder Borer in Portland on a given day, against under 5% in October to May, the lowest months. That is one of Portland's driest months, with about 10 mm of rain against 250 mm in December.
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.
Yes
Of the 5 cities where we can rate Banded Alder Borer sightings, Portland has the highest daily chance: about 10%. Next come Seattle (United States, about 10%) and Vancouver (Canada, under 5%).
Same family: Cerambycidae
The closest relatives of the Banded Alder Borer that you can see in Portland (family Cerambycidae, Longhorn Beetles) are Xestoleptura crassipes (about 10%) and Locust Borer (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 Portland (207 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.
