Catocala subnata
In 3 days ~10% in a week ~20%
Catocala subnata, the youthful underwing, is a moth of the family Erebidae. The species was first described by Augustus Radcliffe Grote in 1864. It is found in North America from Manitoba, Ontario, Quebec, and New Brunswick to Nova Scotia, south through Maine and Connecticut to North Carolina and west to Tennessee, Kentucky, and Texas, then north to Iowa, Wisconsin, and Michigan.
The wingspan is 75–90 mm. Adults are on wing from July to September depending on the location. There is probably one generation per year. The larvae feed on Carya cordiformis, Juglans cinerea and Juglans nigra. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Montreal | 🇨🇦 Canada |
Rare
Under 5% of wildlife watchers report a Youthful Underwing sighting in Montreal on a given day, based on 16 verified sightings from GBIF citizen-science data. It is the 634th most-seen of the 926 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 Youthful Underwing in Montreal on a given day, so our monthly data shows no clear season.
Only Montreal, in our data
Montreal is the only city on Wallace's Line with enough records to rate Youthful 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 Youthful Underwing is recorded against all the insects logged in Montreal (16 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.
