Erynnis pacuvius
In 3 days ~20% in a week ~30%
Erynnis pacuvius, also known as Pacuvius duskywing, Dyar's duskywing or buckthorn dusky wing, is a species of skipper butterfly in the family Hesperiidae. It is found in southern British Columbia and in most of the western United States.
The wingspan is 29–33 mm. The flight period is between June and July in the north with a second generation in the south. The larvae feed on Ceanothus species. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Grand Canyon National Park | 🇺🇸 United States |
More parks will be added in future updates.
With luck
About 10% of wildlife watchers report a Pacuvius Duskywing sighting in Grand Canyon National Park on a given day, based on 5 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 124th most-seen of the 143 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.
May to July
In those months about 10% of wildlife watchers report a Pacuvius Duskywing in Grand Canyon National Park on a given day, against under 5% in August to April, the lowest months. Those are among Grand Canyon National Park's driest months, with about 10 mm of rain a month against 40 mm in March.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Pacuvius Duskywing sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Only Grand Canyon National Park, in our data
Grand Canyon National Park is the only park on Wallace's Line with enough records to rate Pacuvius Duskywing sightings: about 10% of wildlife watchers there report one on a given day.
Same genus: Erynnis
The closest relatives of the Pacuvius Duskywing that you can see in Grand Canyon National Park (genus Erynnis, Duskywings) are Rocky Mountain Duskywing (about 10%) and Dreamy Duskywing (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Pacuvius Duskywing is recorded against all the insects logged in Grand Canyon National Park (5 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.
