Erynnis persius
In 3 days ~10% in a week ~20%
Erynnis persius, commonly known as Persius duskywing, is a species of butterfly in the family Hesperiidae that occurs in North America. The eastern subspecies Erynnis persius persius is rarer and protected by law in some regions.
The upperside of both the forewings and hindwings are a dark brown color. The forewing has clear spots with other dim markings and the patch at the end of the cell is gray. Males have raised white hairs on their forewings. The hindwings are fringed with darker brown to black and have another fringe that is creamy white. Females have a scent scale patch on their 7th abdominal segment. The species may be difficult to distinguish from other duskywing skippers.
Caterpillars of this species are light green with a reddish cast and covered with fine, short hairs. Their head is all brownish black. The Persius Duskywing has a wide range across North America from Alaska to southeastern Manitoba, covering much of the western United States down to Arizona and New Mexico. The eastern population ranges from New England west to Wisconsin, and south to Virginia.
The Persius Duskywing has a single annual generation. The mature... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Kluane National Park | 🇨🇦 Canada | |
| 2 | Denali National Park | 🇺🇸 United States | |
| 3 | Banff National Park | 🇨🇦 Canada | |
| 4 | Jasper National Park | 🇨🇦 Canada | |
| 5 | Rocky Mountain National Park | 🇺🇸 United States | |
| 6 | Glacier National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Calgary | 🇨🇦 Canada |
Rare
Under 5% of wildlife watchers report a Persius Duskywing sighting in Calgary on a given day, based on 21 verified sightings from GBIF citizen-science data. It is the 115th most-seen of the 256 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.
May and June
In those months about 10% of wildlife watchers report a Persius Duskywing in Calgary on a given day, against under 5% in July to April, the lowest months. Those are among Calgary's wettest months, with about 95 mm of rain a month against 15 mm in January.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Persius Duskywing sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Only Calgary, in our data
Calgary is the only city on Wallace's Line with enough records to rate Persius Duskywing sightings: under 5% of wildlife watchers there report one on a given day.
Same family: Hesperiidae
The closest relatives of the Persius Duskywing that you can see in Calgary (family Hesperiidae, Skippers) are Woodland Skipper (about 10%) and Essex Skipper (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Persius Duskywing is recorded against all the insects logged in Calgary (21 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.
