Catocala verrilliana
In 3 days ~10% in a week ~20%
Catocala verrilliana, or Verrill's underwing, is a moth of the family Erebidae. The species was first described by Augustus Radcliffe Grote in 1875. It is found in the US from Washington and Oregon to Colorado and south to California, Arizona and Texas, and Cimarron County in western Oklahoma.
The wingspan is 45–60 mm. Adults are on wing from May to September depending on the location. There is probably one generation per year. The larvae feed on Quercus macrocarpa, Quercus alba and Quercus garryana. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sacramento | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Verrill's Underwing sighting in Sacramento on a given day, based on 9 verified sightings from GBIF citizen-science data. It is the 260th most-seen of the 386 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
In that month about 10% of wildlife watchers report a Verrill's Underwing in Sacramento on a given day, against under 5% in July to May, the lowest months. That is one of Sacramento's driest months, with about 5 mm of rain against 120 mm in December.
Only Sacramento, in our data
Sacramento is the only city on Wallace's Line with enough records to rate Verrill's Underwing sightings: under 5% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Verrill's Underwing is recorded against all the insects logged in Sacramento (9 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.
