Euphyia intermediata
In 3 days ~20% in a week ~30%
Euphyia intermediata, the sharp-angled carpet, is a moth of the family Geometridae. The species was first described by Achille Guenée in 1858. It is found from coast-to-coast in southern Canada and the northern United States, south in the east to North Carolina, south in the west to California, Utah, and possibly Arizona. It is also found north to the Northwest Territories and Alaska.
The European species Euphyia unangulata was previously thought to be Holarctic. The name was therefore also applied to the North American populations. Malcolm J. Scoble et al. in Geometrid Moths of the World (1999) split them into distinct species.
The wingspan is 21–27 mm. Adults are on wing from April to September. There is one generation per year. The larvae feed on various plants, including bedstraw, carnation, chickweed, elm, and mustard. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Shenandoah National Park | 🇺🇸 United States | |
| 2 | Great Smoky Mountains National Park | 🇺🇸 United States | |
| 3 | Acadia National Park | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report an American Sharp-Angled Carpet sighting in Shenandoah National Park on a given day, based on 9 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 406th most-seen of the 723 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 30%, if each day is a fresh chance.
April–May and September
In those months about 10% of wildlife watchers report an American Sharp-Angled Carpet in Shenandoah National Park on a given day, against under 5% in June–August and October–March, the lowest months.
Between 8 and 11 pm
Across all the parks we cover, that three-hour window holds the most American Sharp-Angled Carpet sightings with a recorded time, and about 7 in 10 of them come between 6 pm and 6 am: it is mostly seen at night.
Yes
Of the 3 parks where we can rate American Sharp-Angled Carpet sightings, Shenandoah National Park has the highest daily chance: about 10%. Next come Great Smoky Mountains National Park (United States, about 10%) and Acadia National Park (United States, under 5%).
Same family: Geometridae
The closest relatives of the American Sharp-Angled Carpet that you can see in Shenandoah National Park (family Geometridae, Geometer Moths) are Tulip-Tree Beauty (about 20%), Pale Beauty (about 10%) and Large Maple Spanworm Moth (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the American Sharp-Angled Carpet is recorded against all the insects logged in Shenandoah National Park (9 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.
