Phlogophora periculosa
In 3 days ~10% in a week ~20%
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 |
Rare
Under 5% of wildlife watchers report a Brown Angle Shades sighting in Seattle on a given day, based on 15 verified sightings from GBIF citizen-science data. It is the 223rd most-seen of the 428 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.
August and September
In those months about 10% of wildlife watchers report a Brown Angle Shades in Seattle on a given day, against under 5% in October to July, the lowest months. Those are among Seattle's driest months, with about 45 mm of rain a month against 190 mm in November.
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.
Yes
Of the 2 cities where we can rate Brown Angle Shades sightings, Seattle has the highest daily chance: under 5%. Next come Vancouver (Canada, under 5%).
GBIF citizen-science records
It is estimated from how often the Brown Angle Shades is recorded against all the insects logged in Seattle (15 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.
