Catocala grynea
In 3 days ~10% in a week ~20%
Catocala grynea, the woody underwing, is a moth of the family Erebidae. The species was first described by Pieter Cramer in 1780. It is found in North America from Ontario and Quebec through Maine and Connecticut, south to Florida, west to Texas and north through Iowa to Wisconsin and Minnesota.
The wingspan is 40–50 mm. Adults are on wing from May to September depending on the location. There is probably one generation per year. The larvae feed on Crataegus, Prunus and Malus. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Minneapolis [Saint Paul] | 🇺🇸 United States | |
| 2 | Toronto | 🇨🇦 Canada | |
| 3 | Chicago | 🇺🇸 United States | |
| 4 | Montreal | 🇨🇦 Canada |
Rare
Under 5% of wildlife watchers report a Woody Underwing sighting in Chicago on a given day, based on 10 verified sightings from GBIF citizen-science data. It is the 669th most-seen of the 978 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 Woody Underwing in Chicago on a given day, so our monthly data shows no clear season.
Among the best
Of the 4 cities where we can rate Woody Underwing sightings, Chicago ranks 3rd at under 5%, level with the leaders once rounded. The best odds are in Minneapolis [Saint Paul] (United States, under 5%) and Toronto (Canada, under 5%).
GBIF citizen-science records
It is estimated from how often the Woody Underwing is recorded against all the insects logged in Chicago (10 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.
