Clostera albosigma
In 3 days ~40% in a week ~70%
Clostera albosigma, the sigmoid prominent, is a moth of the family Notodontidae. The species was first described by Asa Fitch in 1856. It is found in North America from Newfoundland west to Vancouver Island, north to the Great Slave Lake and the Northwest Territories and south to at least Missouri.
The wingspan is 28–38 mm. The moth flies from May to August depending on the location. The larvae feed on poplar and willow. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Elk Island National Park | 🇨🇦 Canada | |
| 2 | Acadia National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Edmonton | 🇨🇦 Canada |
Possible
About 20% of wildlife watchers report a Sigmoid Prominent sighting in Elk Island National Park on a given day, based on 19 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 36th most-seen of the 112 insects we can rate there. Over three days the chance rises to about 40%, and over a week to about 70%, if each day is a fresh chance.
May and July
In those months about 30% of wildlife watchers report a Sigmoid Prominent in Elk Island National Park on a given day, against under 5% in August to April, the lowest months. Those are among Elk Island National Park's wettest months, with about 85 mm of rain a month against 20 mm in December.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most Sigmoid Prominent sightings with a recorded time, and about 6 in 10 of them come between 6 am and 6 pm: it is seen both by day and at night.
Yes
Of the 2 parks where we can rate Sigmoid Prominent sightings, Elk Island National Park has the highest daily chance: about 20%. Next come Acadia National Park (United States, under 5%).
Same order: Lepidoptera
The closest relatives of the Sigmoid Prominent that you can see in Elk Island National Park (order Lepidoptera, Butterflies and Moths) are Virginia Ctenucha Moth (about 50%), Pearl Crescent (about 40%) and Red-Spotted Admiral (about 40%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Sigmoid Prominent is recorded against all the insects logged in Elk Island National Park (19 verified sightings from 2019 to 2026), 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.
