Erynnis propertius
In 3 days ~40% in a week ~70%
Erynnis propertius, commonly known as Propertius duskywing, is a species of butterfly in the family Hesperiidae. Propertius duskywings are members of the Pyrginae subfamily. It is found in along the west coast of North America from southern British Columbia south along the Pacific Slope to Baja California Norte. It is one of the most commonly seen skippers in California.
The species was formally described and named by entomologists Samuel Hubbard Scudder and Edward Burgess in 1870. E. propertius was occasionally recorded under different names that are now considered synonymous. These include: Nisoniades propertius, Nisoniades tibullus, and Thanaos propertius.
Larvae E. propertius feed on oaks, particularly Garry oak (Quercus garryana) at the northern edge of the range. Adults E. propertius drink nectar from wildflowers and sometimes feed on damp soil for minerals. E. propertius is known for its close association with oak woodland habitats and localized populations with fragmented oak ecosystems.
E. propertius are physically characterized as small-sized skipper butterflies that have stout bodies, relatively small wings, and hooked antenna tips. E. propertius... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Yosemite National Park | 🇺🇸 United States | |
| 2 | Redwood National Park | 🇺🇸 United States | |
| 3 | Sequoia and Kings Canyon National Parks | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Propertius Duskywing sighting in Yosemite National Park on a given day, based on 55 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 24th most-seen of the 227 insects we can rate there. Over three days the chance rises to about 40%, and over a week to about 70%, if each day is a fresh chance.
April and May
In those months about 30% of wildlife watchers report a Propertius Duskywing in Yosemite National Park on a given day, against under 5% in August to February, the lowest months.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Propertius 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.
Yes
Of the 3 parks where we can rate Propertius Duskywing sightings, Yosemite National Park has the highest daily chance: about 10%. Next come Redwood National Park (United States, about 10%) and Sequoia and Kings Canyon National Parks (United States, about 10%).
Same family: Hesperiidae
The closest relatives of the Propertius Duskywing that you can see in Yosemite National Park (family Hesperiidae, Skippers) are Sandhill Skipper (about 20%), Silver-Spotted Skipper (about 10%) and Woodland Skipper (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Propertius Duskywing is recorded against all the insects logged in Yosemite National Park (55 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.
