Catocala unijuga
In 3 days ~10% in a week ~20%
Catocala unijuga, the once-married underwing, is a moth of the family Erebidae. The species was first described by Francis Walker in 1858. It is found in North America from Newfoundland west to south central British Columbia, south to Kentucky and Missouri in the east, Colorado and Utah in the west.
The wingspan is 68–82 mm (2.7–3.2 in). Adults are on wing from July to September in one generation depending on the location. The larvae feed on Populus tremuloides, Populus nigra and Salix species. 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 an Once-Married Underwing sighting in Montreal on a given day, based on 13 verified sightings from GBIF citizen-science data. It is the 469th 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 an Once-Married Underwing in Montreal on a given day, so our monthly data shows no clear season.
Among the best
Of the 8 cities where we can rate Once-Married Underwing sightings, Montreal ranks 3rd at under 5%, level with the leaders once rounded. The best odds are in Edmonton (Canada, under 5%) and Calgary (Canada, under 5%).
GBIF citizen-science records
It is estimated from how often the Once-Married Underwing is recorded against all the insects logged in Montreal (13 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.
