Catocala semirelicta
In 3 days ~10% in a week ~20%
Catocala semirelicta, the semirelict underwing, is a moth of the family Erebidae. The species was first described by Augustus Radcliffe Grote in 1874. It is found in North America from Nevada, Colorado, Utah, California, and Nova Scotia south to Maine, west across Canada to British Columbia, and southward in the mountains.
The length of the forewings is about 30 mm. The wingspan is 65–75 mm. Adults are on wing from July to September in one generation depending on the location. The larvae feed on Populus balsamifera, Populus tremuloides, and Salix species. There is probably one generation per year. Wikipedia →
| # | Park | Country | Daily sighting probability |
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More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Semirelict Underwing Moth sighting in Portland on a given day, based on 6 verified sightings from GBIF citizen-science data. It is the 427th 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.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Semirelict Underwing Moth in Portland on a given day, so our monthly data shows no clear season.
Among the best
Of the 2 cities where we can rate Semirelict Underwing Moth sightings, Portland ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Edmonton (Canada, under 5%).
GBIF citizen-science records
It is estimated from how often the Semirelict Underwing Moth is recorded against all the insects logged in Portland (6 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.
