Phlogophora periculosa
In 3 days ~10% in a week ~30%
Phlogophora periculosa, the brown angle shades, is a moth of the family Noctuidae. It is found from coast to coast in the northern United States and southern Canada, south in the east to Georgia and Mississippi, south in the west to California (it is not present in Florida and the south-central states).
The wingspan is 42–50 mm. Adults are on wing from late July to October. The larvae feed on the leaves of various woody plants, including alder, balsam fir, cranberry and plum. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Shenandoah National Park | 🇺🇸 United States | |
| 2 | Acadia National Park | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Brown Angle Shades sighting in Acadia National Park on a given day, based on 7 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 270th most-seen of the 405 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
August
In that month about 10% of wildlife watchers report a Brown Angle Shades in Acadia National Park on a given day, against under 5% in September to July, the lowest months.
Between 6 and 9 am
Across all the parks we cover, that three-hour window holds the most Brown Angle Shades sightings with a recorded time, and about half of them come between 6 am and 6 pm: it is most active around dawn and dusk.
Among the best
Of the 2 parks where we can rate Brown Angle Shades sightings, Acadia National Park ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Shenandoah National Park (United States, about 10%).
Same family: Noctuidae
The closest relatives of the Brown Angle Shades that you can see in Acadia National Park (family Noctuidae, Cutworm Moths and Allies) are American Dagger (about 10%), Brown-Hooded Owlet (about 10%) and Eastern Panthea Moth (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Brown Angle Shades is recorded against all the insects logged in Acadia National Park (7 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.
