Catocala blandula
In 3 days ~10% in a week ~30%
Catocala blandula, the charming underwing, is a moth of the family Erebidae. The species was first described by George Duryea Hulst in 1884. It is found in North America from Nova Scotia west to central Alberta, south to Pennsylvania and Wisconsin.
The wingspan is 42–50 mm. Adults are on wing from July to September depending on the location. The larvae feed on Amelanchier, Malus sylvestris and Crataegus. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Great Smoky Mountains National Park | 🇺🇸 United States |
More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Charming Underwing sighting in Edmonton on a given day, based on 18 verified sightings from GBIF citizen-science data. It is the 147th most-seen of the 390 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.
June and July
In those months about 10% of wildlife watchers report a Charming Underwing in Edmonton on a given day, against under 5% in August to May, the lowest months. Those are among Edmonton's wettest months, with about 90 mm of rain a month against 20 mm in February.
Between 10 pm and 1 am
Across all the parks we cover, that three-hour window holds the most Charming Underwing sightings with a recorded time, and nearly all of them come between 6 pm and 6 am: it is mostly seen at night.
Yes
Of the 3 cities where we can rate Charming Underwing sightings, Edmonton has the highest daily chance: under 5%. Next come Calgary (Canada, under 5%) and Toronto (Canada, under 5%).
GBIF citizen-science records
It is estimated from how often the Charming Underwing is recorded against all the insects logged in Edmonton (18 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.
