Ctenucha rubroscapus
In 3 days ~10% in a week ~20%
Ctenucha rubroscapus, the red-shouldered ctenucha moth, is a moth of the family Erebidae. It was described by Édouard Ménétries in 1857. It is found in western North America, limited to low elevations west of the Cascade Mountains, south of Chehalis in Washington. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Redwood National Park | 🇺🇸 United States | |
| 2 | Yosemite National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Portland | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a White-Tipped Ctenucha sighting in Portland on a given day, based on 15 verified sightings from GBIF citizen-science data. It is the 269th most-seen of the 507 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
June and July
In those months about 10% of wildlife watchers report a White-Tipped Ctenucha in Portland on a given day, against under 5% in August to May, the lowest months. Those are among Portland's driest months, with about 35 mm of rain a month against 250 mm in December.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most White-Tipped Ctenucha sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Only Portland, in our data
Portland is the only city on Wallace's Line with enough records to rate White-Tipped Ctenucha sightings: under 5% of wildlife watchers there report one on a given day.
Same family: Erebidae
The closest relatives of the White-Tipped Ctenucha that you can see in Portland (family Erebidae, Underwing, Tiger, Tussock, and Allied Moths) are Isabella Tiger Moth (about 20%), Cinnabar Moth (about 20%) and Arctia tigrina (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the White-Tipped Ctenucha is recorded against all the insects logged in Portland (15 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.
